| alder.3011 |
3011 |
|
LK20150036 |
|
Lovisagruvan (coordinates from fig 7) |
Rhyolite |
Grey-beige weakly Qz-Fsp-phyric rhyolitic sandstone, footwall |
|
|
|
Svecokarelian Orogen |
Bergslagen lithotectonic unit |
|
Supracrustal rock c. 1.96-1.86 Ga (Svecofennian) |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Weighted average 207Pb/206Pb age |
1892.0 |
5.0 |
5.0 |
5.0 |
|
|
|
|
33 |
8 |
1.10000002 |
0.40000001 |
5 |
Magmatic age |
Not classified |
Euhedral short prismatic to anhedral zircon with weak oscillatory zonation, some sections are unzoned and BSE-bright. 8 analyses including oscillatory zoned euhedral zircon, BSE-bright replacements in crystal core regions and unzoned BSE-bright non-complex crystal sections define a Concordia age of 1888 ± 6 Ma (2s, MSWD = 0.8, prob. of fit = 0.7) and a wtd aver. 207Pb/206Pb age of 1892 ± 5 Ma (2s, MSWD = 1.1, prob. Of fit = 0.4). |
Jansson et al 2025 |
Jansson, N.F., Andersson, J., Rodushkin, I., Engström, E. & Billström, K., 2025: Stable (Zn, Cd, Fe) and radiogenic (U, Pb) metal isotope constraints on the age, genesis and modification of the Lovisa Zn-Pb sulfide deposit, Bergslagen, Sweden. Mineralium Deposita (2025), 22 pp. |
https://doi.org/10.1007/s00126-025-01367-7 |
2025 |
|
xxx |
Apr 29, 2025, 1:27:14 PM |
fhm |
1 |
6620264 |
509296 |
|
|
|
11F4c |
| alder.3012 |
3012 |
|
LK20150038 |
|
Lovisagruvan (coordinates from fig 7) |
Rhyolite |
Feldspar-quartz-phyric rhyolitic pumice
breccia, hanging wall |
|
|
|
Svecokarelian Orogen |
Bergslagen lithotectonic unit |
|
Supracrustal rock c. 1.96-1.86 Ga (Svecofennian) |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Weighted average 207Pb/206Pb age |
1891.0 |
3.0 |
3.0 |
3.0 |
|
|
|
|
27 |
13 |
1.5 |
0.1 |
5 |
Magmatic age |
Not classified |
Subhedral short prismatic to anhedral zircon weak oscillatory zonation. Some crystal sections are unzoned and BSE-bright. Thirteen analyses define a Concordia age of 1883 ± 7 Ma (95% confidence interval, MSWD = 2, probability of fit = 0.002) and a weighted average 207Pb/206Pb age of 1891 ± 3 Ma (Fig. 8F; 2s, MSWD = 1.5, prob. of fit = 0.1). |
Jansson et al 2025 |
Jansson, N.F., Andersson, J., Rodushkin, I., Engström, E. & Billström, K., 2025: Stable (Zn, Cd, Fe) and radiogenic (U, Pb) metal isotope constraints on the age, genesis and modification of the Lovisa Zn-Pb sulfide deposit, Bergslagen, Sweden. Mineralium Deposita (2025), 22 pp. |
https://doi.org/10.1007/s00126-025-01367-7 |
2025 |
|
xxx |
Apr 29, 2025, 1:27:18 PM |
fhm |
1 |
6620263 |
509263 |
|
|
|
11F4c |
| alder.3013 |
3013 |
|
VST-10B |
|
Vássaloamijávri |
Granite |
Granite |
Vistas granite |
Vássac?orru Igneous Complex |
Mårma terrane |
Caledonian Orogen |
Seve Nappe Complex |
|
Neoproterozoic 1.0-0.54 Ga |
Vegacenter, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
Laser ICP-MS |
Zircon |
Concordant age |
864.0 |
3.0 |
3.0 |
3.0 |
|
|
|
|
|
18 |
0.92000002 |
|
5 |
Magmatic age |
Not classified |
Zircon shows core–rim textures, predominantly characterized by oscillatory or sector zoning. Seven U–Pb analyses on the zircon cores yield Mesoproterozoic and Paleoproterozoic 206Pb/207Pb ages (c. 1200 to c. 1700 Ma;). 18 rims define a concordia age of 863.9 ± 3.4 Ma (MSWD = 0.92), interpreted as the emplacement of the granite. |
Callegari et al 2023 |
Callegari, R., Kosminska, K., Barnes, C.J., Klonowska, I., Barker, A.K., Rousku, S., Nääs, E., Kooijman, E., Witt-Nilsson, P., Majka, J., 2023: Early Neoproterozoic magmatism and Caledonian metamorphism recorded by the Mårma terrane, Seve Nappe Complex, northern Swedish Caledonides. Journal of the Geological Society 180, jgs2022-092, 1-18. |
https://doi.org/10.1144/jgs2022-092 |
2023 |
|
xxx |
Oct 7, 2025, 9:24:11 AM |
fhm |
1 |
7549863 |
654249 |
|
|
|
30I0e |
| alder.3014 |
3014 |
|
VST-10A |
|
Vássaloamijávri |
Granite |
Granite dyke |
|
Vássac?orru Igneous Complex |
Mårma terrane |
Caledonian Orogen |
Seve Nappe Complex |
|
Neoproterozoic 1.0-0.54 Ga |
Vegacenter, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
Laser ICP-MS |
Zircon |
Concordant age |
840.0 |
7.0 |
7.0 |
7.0 |
|
|
|
|
|
18 |
4.30000019 |
|
5 |
Magmatic age |
Not classified |
Zircon displays predominantly oscillatory or sector zoning. 20 U–Pb analyses of the zircon cores provided dates ranging between c.1100 to c.1800 Ma. 18 rim analyses yield a concordia age of 840.3 ± 7.1 Ma (MSWD = 4.3), interpreted as the emplacement of the granite dyke. |
Callegari et al 2023 |
Callegari, R., Kosminska, K., Barnes, C.J., Klonowska, I., Barker, A.K., Rousku, S., Nääs, E., Kooijman, E., Witt-Nilsson, P., Majka, J., 2023: Early Neoproterozoic magmatism and Caledonian metamorphism recorded by the Mårma terrane, Seve Nappe Complex, northern Swedish Caledonides. Journal of the Geological Society 180, jgs2022-092, 1-18. |
https://doi.org/10.1144/jgs2022-092 |
2023 |
|
xxx |
Oct 7, 2025, 9:55:25 AM |
fhm |
1 |
7549863 |
654249 |
|
|
|
30I0e |
| alder.3015 |
3015 |
|
VST-8C |
|
Vássajávri |
Gabbro |
Gabbro |
|
Vássac?orru Igneous Complex |
Mårma terrane |
Caledonian Orogen |
Seve Nappe Complex |
|
Neoproterozoic 1.0-0.54 Ga |
Vegacenter, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
Laser ICP-MS |
Zircon |
Concordant age |
856.0 |
3.0 |
3.0 |
3.0 |
|
|
|
|
23 |
10 |
2.79999995 |
|
5 |
Magmatic age |
Not classified |
U–Pb zircon analyses provided a concordia age of 855.9 ± 2.9 Ma (MSWD = 2.8) |
Callegari et al 2023 |
Callegari, R., Kosminska, K., Barnes, C.J., Klonowska, I., Barker, A.K., Rousku, S., Nääs, E., Kooijman, E., Witt-Nilsson, P., Majka, J., 2023: Early Neoproterozoic magmatism and Caledonian metamorphism recorded by the Mårma terrane, Seve Nappe Complex, northern Swedish Caledonides. Journal of the Geological Society 180, jgs2022-092, 1-18. |
https://doi.org/10.1144/jgs2022-092 |
2023 |
|
xxx |
Oct 7, 2025, 10:24:44 AM |
fhm |
1 |
7552815 |
654678 |
|
|
|
30I0e |
| alder.3016 |
3016 |
|
VST-8A |
|
Vássajávri |
Granodiorite |
Granodiorite dyke within the VIC gabbro |
|
Vássac?orru Igneous Complex |
Mårma terrane |
Caledonian Orogen |
Seve Nappe Complex |
|
Neoproterozoic 1.0-0.54 Ga |
Vegacenter, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
Laser ICP-MS |
Zircon |
Concordant age |
850.0 |
1.0 |
1.0 |
1.0 |
|
|
|
|
78 |
38 |
1.5 |
|
5 |
Magmatic age |
Not classified |
U–Pb analyses were conducted on 55 zircon grains providing a concordia age of 850.1 ± 1.2 Ma (MSWD = 1.5, n=38) |
Callegari et al 2023 |
Callegari, R., Kosminska, K., Barnes, C.J., Klonowska, I., Barker, A.K., Rousku, S., Nääs, E., Kooijman, E., Witt-Nilsson, P., Majka, J., 2023: Early Neoproterozoic magmatism and Caledonian metamorphism recorded by the Mårma terrane, Seve Nappe Complex, northern Swedish Caledonides. Journal of the Geological Society 180, jgs2022-092, 1-18. |
https://doi.org/10.1144/jgs2022-092 |
2023 |
|
xxx |
Oct 7, 2025, 10:30:58 AM |
fhm |
1 |
7552815 |
654678 |
|
|
|
30I0e |
| alder.3017 |
3017 |
|
KB17-14b |
|
Mádir |
Orthogneiss |
Mylonitic orthogneiss |
Leavasvággi gneiss |
|
|
Caledonian Orogen |
Seve Nappe Complex |
|
Neoproterozoic 1.0-0.54 Ga |
Vegacenter, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
Laser ICP-MS |
Zircon |
Concordant age |
835.0 |
8.0 |
8.0 |
8.0 |
|
|
|
|
|
5 |
0.70999998 |
|
5 |
Magmatic age |
Not classified |
The BSE images of zircon reveal core and rim textures, and locally oscillatory zoning. Zircon cores yield a spread in ages of c. 1400 to c.1800 Ma (n = 12). The zircon rims yielded a concordia age of 834.6 ± 8.1 Ma (n = 5; MSWD = 0.71), interpreted as the protolith age of the mylonitic orthogneiss. |
Callegari et al 2023 |
Callegari, R., Kosminska, K., Barnes, C.J., Klonowska, I., Barker, A.K., Rousku, S., Nääs, E., Kooijman, E., Witt-Nilsson, P., Majka, J., 2023: Early Neoproterozoic magmatism and Caledonian metamorphism recorded by the Mårma terrane, Seve Nappe Complex, northern Swedish Caledonides. Journal of the Geological Society 180, jgs2022-092, 1-18. |
https://doi.org/10.1144/jgs2022-092 |
2023 |
|
xxx |
Oct 7, 2025, 10:37:05 AM |
fhm |
1 |
7532929 |
638853 |
|
|
|
29I6b |
| alder.3018 |
3018 |
|
KB17-14b |
|
Mádir |
Orthogneiss |
Mylonitic orthogneiss |
Leavasvággi gneiss |
|
Mårma terrane |
Caledonian Orogen |
Seve Nappe Complex |
|
Neoproterozoic 1.0-0.54 Ga |
Vegacenter, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
Laser ICP-MS |
Monazite |
Upper intercept age |
841.0 |
7.0 |
7.0 |
7.0 |
|
|
443.0 |
20.0 |
|
64 |
63.0 |
3.0999999 |
5 |
Magmatic age |
Not classified |
U–Pb analyses are dispersed along an array, with most of the results located close to the upper intercept at 840.7 ± 7.3 Ma (MSWD =3.1) and two at the lower intercept of 442.7 ± 19.9 Ma. The former age is interpreted as the protolith age of the mylonitic orthogneiss and the latter as a metamorphic age. |
Callegari et al 2023 |
Callegari, R., Kosminska, K., Barnes, C.J., Klonowska, I., Barker, A.K., Rousku, S., Nääs, E., Kooijman, E., Witt-Nilsson, P., Majka, J., 2023: Early Neoproterozoic magmatism and Caledonian metamorphism recorded by the Mårma terrane, Seve Nappe Complex, northern Swedish Caledonides. Journal of the Geological Society 180, jgs2022-092, 1-18. |
https://doi.org/10.1144/jgs2022-092 |
2023 |
|
xxx |
Oct 7, 2025, 10:41:23 AM |
fhm |
1 |
7532929 |
638853 |
|
|
|
29I6b |
| alder.3019 |
3019 |
|
KB17-14b |
|
Mádir |
Orthogneiss |
Mylonitic orthogneiss |
Leavasvággi gneiss |
|
Mårma terrane |
Caledonian Orogen |
Seve Nappe Complex |
|
Neoproterozoic 1.0-0.54 Ga |
Vegacenter, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
Laser ICP-MS |
Monazite |
Lower intercept age |
443.0 |
20.0 |
20.0 |
20.0 |
|
|
|
|
|
64 |
63.0 |
3.0999999 |
1 |
Metamorphic age |
Not classified |
U–Pb analyses are dispersed along an array, with most of the results located close to the upper intercept at 840.7 ± 7.3 Ma (MSWD =3.1) and two at the lower intercept of 442.7 ± 19.9 Ma. The former age is interpreted as the protolith age of the mylonitic orthogneiss and the latter as a metamorphic age. |
Callegari et al 2023 |
Callegari, R., Kosminska, K., Barnes, C.J., Klonowska, I., Barker, A.K., Rousku, S., Nääs, E., Kooijman, E., Witt-Nilsson, P., Majka, J., 2023: Early Neoproterozoic magmatism and Caledonian metamorphism recorded by the Mårma terrane, Seve Nappe Complex, northern Swedish Caledonides. Journal of the Geological Society 180, jgs2022-092, 1-18. |
https://doi.org/10.1144/jgs2022-092 |
2023 |
|
xxx |
Oct 7, 2025, 11:03:43 AM |
fhm |
1 |
7532929 |
638853 |
|
|
|
29I6b |
| alder.3020 |
3020 |
SLH211007A |
|
n6603 |
Enåsengruvan |
Granite |
Granite, sample taken about two meters from the contact to biotit-sillimanite gneiss. |
|
|
|
Svecokarelian Orogen |
Ljusdal lithotectonic unit |
|
Stratigraphic position unknown |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Concordant age |
1825.0 |
7.0 |
7.0 |
7.0 |
|
|
|
|
|
3 |
0.23999999 |
|
0 |
not known |
Not classified |
Zircons are euhedrala to subhedral with inherited cores and oscillatory zoned overgrowths. Three core analyses gave a
concordia age of 1 825 ± 7 Ma (2s, MSWD = 0.24). Analyses of 8 zircon rims and one core form a discordia with an upper intercept age of 1707 ± 4 Ma and a lower intercept of 431 ± 21 Ma (2s, MSWD = 2,3). One analysis (SLH211007-4b) gave a concordant age at 1795 ± 13 Ma, suggested to possibly represent mixing of core and rim material. Values of common lead are not presented, nor images of analysed zircons. |
Jonsson et al 2025 |
Jonsson, E., Jönberger, J., Luth, S., Bergman, S., Pieslinger, S.& Morris, G., 2025: Enåsens guld-koppargruva – mineralogi, geofysik och geologisk 3D-modellering. Sveriges geologisk undersökning SGU-rapport rapport 2025:09, 188 pp. |
https://resource.sgu.se/dokument/publikation/sgurapport/sgurapport202509rapport/s2509-rapport.pdf |
2025 |
|
xxx |
Oct 9, 2025, 12:50:08 PM |
fhm |
1 |
6906025 |
519375 |
|
|
|
17F1f |
| alder.3021 |
3021 |
SLH211007A |
|
n6603 |
Enåsengruvan |
Granite |
Granite, sample taken about two meters from the contact to biotit-sillimanite gneiss. |
|
|
|
Svecokarelian Orogen |
Ljusdal lithotectonic unit |
|
Stratigraphic position unknown |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Upper intercept age |
1707.0 |
4.0 |
4.0 |
4.0 |
|
|
431.0 |
21.0 |
|
9 |
2.29999995 |
|
0 |
not known |
Not classified |
Zircons are euhedrala to subhedral with inherited cores and oscillatory zoned overgrowths. Three core analyses gave a
concordia age of 1 825 ± 7 Ma (2s, MSWD = 0.24). Analyses of 8 zircon rims and one core form a discordia with an upper intercept age of 1707 ± 4 Ma and a lower intercept of 431±21 Ma (2s, MSWD = 2,3). One analysis (SLH211007-4b) gave a concordant age at 1795 ± 13 Ma, suggested to possibly represent mixing of core and rim material. Values of common lead are not presented, nor images of analysed zircons. |
Jonsson et al 2025 |
Jonsson, E., Jönberger, J., Luth, S., Bergman, S., Pieslinger, S.& Morris, G., 2025: Enåsens guld-koppargruva – mineralogi, geofysik och geologisk 3D-modellering. Sveriges geologisk undersökning SGU-rapport rapport 2025:09, 188 pp. |
https://resource.sgu.se/dokument/publikation/sgurapport/sgurapport202509rapport/s2509-rapport.pdf |
2025 |
|
xxx |
Oct 9, 2025, 1:04:28 PM |
fhm |
1 |
6906025 |
519375 |
|
|
|
17F1f |
| alder.3022 |
3022 |
SLH211064A |
|
n6759 |
Enåsen |
Migmatite |
Migmatitic garnet gneiss with centimeter wide bands of quartz-fältspat and biotite. |
|
|
|
Svecokarelian Orogen |
Ljusdal lithotectonic unit |
|
Stratigraphic position unknown |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Concordant age |
1842.0 |
3.0 |
3.0 |
3.0 |
|
|
|
|
20 |
8 |
1.70000005 |
|
5 |
Magmatic age |
Not classified |
Zircons are generally elongated, euhedral to subhedral and show overgrowths and oscillatory zonation with altered parts. Eight analyses are concordant with a concordia age of 1842±3 Ma (2s, MSWD = 1.7), interpreted as the protolith age of the gneiss. |
Jonsson et al 2025 |
Jonsson, E., Jönberger, J., Luth, S., Bergman, S., Pieslinger, S.& Morris, G., 2025: Enåsens guld-koppargruva – mineralogi, geofysik och geologisk 3D-modellering. Sveriges geologisk undersökning SGU-rapport rapport 2025:09, 188 pp. |
https://resource.sgu.se/dokument/publikation/sgurapport/sgurapport202509rapport/s2509-rapport.pdf |
2025 |
|
xxx |
Oct 9, 2025, 1:51:41 PM |
fhm |
1 |
6905399 |
518841 |
|
|
|
17F1f |
| alder.3023 |
3023 |
KES210006A |
|
n6604 |
Malsjöberget |
Felsic volcanic rock |
Felsic metavolcanic rock, mineralised with pyrite |
|
|
|
Svecokarelian Orogen |
Ljusdal lithotectonic unit |
|
Stratigraphic position unknown |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Concordant age |
1854.0 |
3.0 |
3.0 |
3.0 |
|
|
|
|
|
3 |
0.03 |
|
5 |
Magmatic age |
Not classified |
Zircons are mostly subhedral to euhedral. Many grains have distinct cores and some are altered, avoided in analyses. There are two age groups. One older group is defined by three concordant or near concordant analyses with a concordia age of 1854 ± 3 Ma (2s, MSWD = 0,03). The analyses of the younger age group plot on a discordia with an upper intercept age of 1823 ± 6 Ma (2s, MSWD = 7, n = 10). Age interpretation is uncertain. The older age was suggested to possibly represent the igneous crystallisation age of the volcanic rock.Values of common lead are not presented, nor images of analysed zircons. |
Jonsson et al 2025 |
Jonsson, E., Jönberger, J., Luth, S., Bergman, S., Pieslinger, S.& Morris, G., 2025: Enåsens guld-koppargruva – mineralogi, geofysik och geologisk 3D-modellering. Sveriges geologisk undersökning SGU-rapport rapport 2025:09, 188 pp. |
https://resource.sgu.se/dokument/publikation/sgurapport/sgurapport202509rapport/s2509-rapport.pdf |
2025 |
|
xxx |
Oct 9, 2025, 2:31:59 PM |
fhm |
1 |
6909967 |
519913 |
|
|
|
17F2f |
| alder.3024 |
3024 |
KES210006A |
|
n6604 |
Malsjöberget |
Felsic volcanic rock |
Felsic metavolcanic rock, mineralised with pyrite |
|
|
|
Svecokarelian Orogen |
Ljusdal lithotectonic unit |
|
Stratigraphic position unknown |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Concordant age |
1823.0 |
6.0 |
6.0 |
6.0 |
|
|
388.0 |
6.0 |
|
10 |
7.0 |
|
0 |
not known |
Not classified |
Zircons are mostly subhedral to euhedral. Many grains have distinct cores and some are altered, avoided in analyses. There are two age groups. One older group is defined by three concordant or near concordant analyses gave a concordia age of 1854 ± 3 Ma (2s, MSWD = 0,03). The analyses of the younger age group plot on a discordia with an upper intercept age of 1823 ± 6 Ma and a lower intercept at 388 ± 18 Ma (2s, MSWD = 7, n = 10).Values of common lead are not presented, nor images of analysed zircons. |
Jonsson et al 2025 |
Jonsson, E., Jönberger, J., Luth, S., Bergman, S., Pieslinger, S.& Morris, G., 2025: Enåsens guld-koppargruva – mineralogi, geofysik och geologisk 3D-modellering. Sveriges geologisk undersökning SGU-rapport rapport 2025:09, 188 pp. |
https://resource.sgu.se/dokument/publikation/sgurapport/sgurapport202509rapport/s2509-rapport.pdf |
2025 |
|
xxx |
Oct 9, 2025, 3:50:50 PM |
fhm |
1 |
6909967 |
519913 |
|
|
|
17F2f |
| alder.3025 |
3025 |
KES210006B |
|
n6605 |
Malsjöberget |
Felsic volcanic rock |
Felsic metasubvolcanic rock |
|
|
|
Svecokarelian Orogen |
Ljusdal lithotectonic unit |
|
Stratigraphic position unknown |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Not known |
|
|
|
|
1830.0 |
1880.0 |
|
|
8 |
|
|
|
0 |
not known |
Not classified |
Zircons are mostly euhedral with core and rims. Cores are usually altered, avoided in analyses. Two analyses are concordant with ages at c. 1.88 Ga ( 1 877 ± 11 Ma) and c. 1.83 Ga ( 1 834 ± 8 Ma).Values of common lead are not presented, nor images of analysed zircons. |
Jonsson et al 2025 |
Jonsson, E., Jönberger, J., Luth, S., Bergman, S., Pieslinger, S.& Morris, G., 2025: Enåsens guld-koppargruva – mineralogi, geofysik och geologisk 3D-modellering. Sveriges geologisk undersökning SGU-rapport rapport 2025:09, 188 pp. |
https://resource.sgu.se/dokument/publikation/sgurapport/sgurapport202509rapport/s2509-rapport.pdf |
2025 |
|
xxx |
Oct 9, 2025, 4:03:49 PM |
fhm |
1 |
6909967 |
519913 |
|
|
|
17F2f |
| alder.3026 |
3026 |
|
GU01 |
|
Guobijohka |
Amphibolite |
Banded amphibolite, migmatitic fabric with alternating melanocratic and leucocratic layers |
Vierrucohkka amphibolite |
|
|
Caledonian Orogen |
Seve Nappe Complex |
|
Neoproterozoic 1.0-0.54 Ga |
Vegacenter, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
Laser ICP-MS |
Zircon |
Concordant age |
626.0 |
7.0 |
7.0 |
7.0 |
|
|
|
|
|
5 |
0.75 |
|
5 |
Magmatic age |
Not classified |
Zircon exhibit core-rim textures, predominantly characterized by oscillatory zoning. Five U-Pb analyses of zircon cores yield a Concordia age of 626.3 ± 6.9 Ma (MSWD = 0.75). Seven analyses of zircon rims define a Concordia age of 598.8 ± 2.8 Ma (MSWD = 1.2). Two analyses from zircon rims gave a younger Concordia age of 469 ± 2.1 Ma (MSWD = 0.62). |
Callegari et al 2024 |
Callegari, R., Barker, A.K., Barnes, C.J., Walczak, K., Ziemniak, G., Klonowska, I., Kooijman, E., Rousku S., Kosminska, K. & Majka, J., 2024: A depleted mantle source for Neoproterozoic continental rifting in the Seve Nappe Complex, Kebnekaise region, northern Swedish Caledonides. Frontiers in Earth Science 12, 1426525, 1-22. |
https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2024.1426525 |
2024 |
|
xxx |
Oct 13, 2025, 7:07:06 AM |
fhm |
1 |
7536322 |
641222 |
|
|
|
29I7b |
| alder.3027 |
3027 |
|
GU01 |
|
Guobijohka |
Amphibolite |
Banded amphibolite, migmatitic fabric with alternating melanocratic and leucocratic layers |
Vierrucohkka amphibolite |
|
|
Caledonian Orogen |
Seve Nappe Complex |
|
Neoproterozoic 1.0-0.54 Ga |
Vegacenter, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
Laser ICP-MS |
Zircon |
Concordant age |
599.0 |
3.0 |
3.0 |
3.0 |
|
|
|
|
|
7 |
1.20000005 |
|
1 |
Metamorphic age |
Not classified |
Zircon exhibit core-rim textures, predominantly characterized by oscillatory zoning. Five U-Pb analyses of zircon cores yield a Concordia age of 626.3 ± 6.9 Ma (MSWD = 0.75). Seven analyses of zircon rims define a Concordia age of 598.8 ± 2.8 Ma (MSWD = 1.2). Two analyses from zircon rims gave a younger Concordia age of 469 ± 2.1 Ma (MSWD = 0.62). |
Callegari et al 2024 |
Callegari, R., Barker, A.K., Barnes, C.J., Walczak, K., Ziemniak, G., Klonowska, I., Kooijman, E., Rousku S., Kosminska, K. & Majka, J., 2024: A depleted mantle source for Neoproterozoic continental rifting in the Seve Nappe Complex, Kebnekaise region, northern Swedish Caledonides. Frontiers in Earth Science 12, 1426525, 1-22. |
https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2024.1426525 |
2024 |
|
xxx |
Oct 13, 2025, 7:07:20 AM |
fhm |
1 |
7536322 |
641222 |
|
|
|
29I7b |
| alder.3028 |
3028 |
|
GU01 |
|
Guobijohka |
Amphibolite |
Banded amphibolite, migmatitic fabric with alternating melanocratic and leucocratic layers |
Vierrucohkka amphibolite |
|
|
Caledonian Orogen |
Seve Nappe Complex |
|
Neoproterozoic 1.0-0.54 Ga |
Vegacenter, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
Laser ICP-MS |
Zircon |
Concordant age |
469.0 |
2.0 |
2.0 |
2.0 |
|
|
|
|
|
2 |
0.62 |
|
0 |
not known |
Not classified |
Zircon exhibit core-rim textures, predominantly characterized by oscillatory zoning.Five U-Pb analyses of zircon cores yield a Concordia age of 626.3 ± 6.9 Ma (MSWD = 0.75). Seven analyses of zircon rims define a Concordia age of 598.8 ± 2.8 Ma (MSWD = 1.2). Two analyses from zircon rims gave a younger Concordia age of 469 ± 2.1 Ma (MSWD = 0.62). |
Callegari et al 2024 |
Callegari, R., Barker, A.K., Barnes, C.J., Walczak, K., Ziemniak, G., Klonowska, I., Kooijman, E., Rousku S., Kosminska, K. & Majka, J., 2024: A depleted mantle source for Neoproterozoic continental rifting in the Seve Nappe Complex, Kebnekaise region, northern Swedish Caledonides. Frontiers in Earth Science 12, 1426525, 1-22. |
https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2024.1426525 |
2024 |
|
xxx |
Oct 13, 2025, 7:46:43 AM |
fhm |
1 |
7536322 |
641222 |
|
|
|
29I7b |
| alder.3029 |
3029 |
|
ARK13 |
|
Unna Avrrik |
Gabbro |
Metagabbro |
Aurek gabbro |
|
|
Caledonian Orogen |
Seve Nappe Complex |
|
Neoproterozoic 1.0-0.54 Ga |
Vegacenter, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
Laser ICP-MS |
Zircon |
Concordant age |
614.0 |
2.0 |
2.0 |
2.0 |
|
|
|
|
|
9 |
0.36000001 |
|
5 |
Magmatic age |
Not classified |
Zircon predominantly display sector zoning. One U-Pb analysis yielded a concordia age of 670.2 ± 7.7 Ma (MSWD = 0.56). Nine core measurements indicate a Concordia age of 614.4 ± 2.0 Ma (MSWD =0.36). Two rim analyses yielded a Concordia age of 600.6 ± 4.3 Ma (MSWD = 2.1). |
Callegari et al 2024 |
Callegari, R., Barker, A.K., Barnes, C.J., Walczak, K., Ziemniak, G., Klonowska, I., Kooijman, E., Rousku S., Kosminska, K. & Majka, J., 2024: A depleted mantle source for Neoproterozoic continental rifting in the Seve Nappe Complex, Kebnekaise region, northern Swedish Caledonides. Frontiers in Earth Science 12, 1426525, 1-22. |
https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2024.1426525 |
2024 |
|
xxx |
Oct 13, 2025, 7:49:16 AM |
fhm |
1 |
7527695 |
636712 |
|
|
|
29I5a |
| alder.3030 |
3030 |
|
ARK13 |
|
Unna Avrrik |
Gabbroid |
Metagabbro |
Aurek gabbro |
|
|
Caledonian Orogen |
Seve Nappe Complex |
|
Neoproterozoic 1.0-0.54 Ga |
Vegacenter, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
Laser ICP-MS |
Zircon |
Concordant age |
601.0 |
4.0 |
4.0 |
4.0 |
|
|
|
|
|
2 |
2.0999999 |
|
0 |
not known |
Not classified |
Zircon predominantly display sector zoning. One U-Pb analysis yielded a concordia age of 670.2 ± 7.7 Ma (MSWD = 0.56). Nine core measurements indicate a Concordia age of 614.4 ± 2.0 Ma (MSWD =0.36). Two rim analyses yielded a Concordia age of 600.6 ± 4.3 Ma (MSWD = 2.1). |
Callegari et al 2024 |
Callegari, R., Barker, A.K., Barnes, C.J., Walczak, K., Ziemniak, G., Klonowska, I., Kooijman, E., Rousku S., Kosminska, K. & Majka, J., 2024: A depleted mantle source for Neoproterozoic continental rifting in the Seve Nappe Complex, Kebnekaise region, northern Swedish Caledonides. Frontiers in Earth Science 12, 1426525, 1-22. |
https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2024.1426525 |
2024 |
|
xxx |
Oct 13, 2025, 8:42:59 AM |
fhm |
1 |
7527695 |
636712 |
|
|
|
29I5a |
| alder.3031 |
3031 |
|
ARK11 |
|
Unna Avrrik |
Amphibolite |
Amphibolite |
Aurek amphibolite |
|
|
Caledonian Orogen |
Seve Nappe Complex |
|
Neoproterozoic 1.0-0.54 Ga |
Vegacenter, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
Laser ICP-MS |
Zircon |
Concordant age |
609.0 |
2.0 |
2.0 |
2.0 |
|
|
|
|
|
35 |
0.92000002 |
|
5 |
Magmatic age |
Not classified |
Zircon show core-rim textures. 35 U-Pb cores analyses yield Concordia age of 609.3 ± 1.6 Ma (MSWD = 0.92). Results from two
rim measurements indicate a Concordia age of 523.1 ± 7.4 Ma (MSWD= 0.15). Two more rim analyses defined a Concordia
age of 424.9 ± 8.5 Ma (MSWD = 0.09). |
Callegari et al 2024 |
Callegari, R., Barker, A.K., Barnes, C.J., Walczak, K., Ziemniak, G., Klonowska, I., Kooijman, E., Rousku S., Kosminska, K. & Majka, J., 2024: A depleted mantle source for Neoproterozoic continental rifting in the Seve Nappe Complex, Kebnekaise region, northern Swedish Caledonides. Frontiers in Earth Science 12, 1426525, 1-22. |
https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2024.1426525 |
2024 |
|
xxx |
Oct 13, 2025, 8:45:17 AM |
fhm |
1 |
7527731 |
636688 |
|
|
|
29I5a |
| alder.3032 |
3032 |
|
ARK11 |
|
Unna Avrrik |
Amphibolite |
Amphibolite |
Aurek amphibolite |
|
|
Caledonian Orogen |
Seve Nappe Complex |
|
Neoproterozoic 1.0-0.54 Ga |
Vegacenter, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
Laser ICP-MS |
Zircon |
Concordant age |
523.0 |
7.0 |
7.0 |
7.0 |
|
|
|
|
|
2 |
0.15000001 |
|
0 |
not known |
Not classified |
Zircon show core-rim textures. 35 U-Pb cores analyses yield Concordia age of 609.3 ± 1.6 Ma (MSWD = 0.92). Results from two
rim measurements indicate a Concordia age of 523.1 ± 7.4 Ma (MSWD= 0.15). Two more rim analyses defined a Concordia
age of 424.9 ± 8.5 Ma (MSWD = 0.09). |
Callegari et al 2024 |
Callegari, R., Barker, A.K., Barnes, C.J., Walczak, K., Ziemniak, G., Klonowska, I., Kooijman, E., Rousku S., Kosminska, K. & Majka, J., 2024: A depleted mantle source for Neoproterozoic continental rifting in the Seve Nappe Complex, Kebnekaise region, northern Swedish Caledonides. Frontiers in Earth Science 12, 1426525, 1-22. |
https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2024.1426525 |
2024 |
|
xxx |
Oct 13, 2025, 8:52:04 AM |
fhm |
1 |
7527731 |
636688 |
|
|
|
29I5a |
| alder.3033 |
3033 |
|
ARK11 |
|
Unna Avrrik |
Amphibolite |
Amphibolite |
Aurek amphibolite |
|
|
Caledonian Orogen |
Seve Nappe Complex |
|
Neoproterozoic 1.0-0.54 Ga |
Vegacenter, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
Laser ICP-MS |
Zircon |
Concordant age |
425.0 |
9.0 |
9.0 |
9.0 |
|
|
|
|
|
2 |
0.09 |
|
0 |
not known |
Not classified |
Zircon show core-rim textures. 35 U-Pb cores analyses yield Concordia age of 609.3 ± 1.6 Ma (MSWD = 0.92). Results from two
rim measurements indicate a Concordia age of 523.1 ± 7.4 Ma (MSWD= 0.15). Two more rim analyses defined a Concordia
age of 424.9 ± 8.5 Ma (MSWD = 0.09). |
Callegari et al 2024 |
Callegari, R., Barker, A.K., Barnes, C.J., Walczak, K., Ziemniak, G., Klonowska, I., Kooijman, E., Rousku S., Kosminska, K. & Majka, J., 2024: A depleted mantle source for Neoproterozoic continental rifting in the Seve Nappe Complex, Kebnekaise region, northern Swedish Caledonides. Frontiers in Earth Science 12, 1426525, 1-22. |
https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2024.1426525 |
2024 |
|
xxx |
Oct 13, 2025, 8:52:11 AM |
fhm |
1 |
7527731 |
636688 |
|
|
|
29I5a |
| alder.3034 |
3034 |
|
JMY-19a |
|
Norder Tväråklumpen |
Migmatite |
Migmatitic paragneiss (microdiamond-bearing) |
|
|
|
Caledonian Orogen |
Seve Nappe Complex |
|
Stratigraphic position unknown |
University of New Brunswick’s LA–ICP–MS Laboratory, Fredericton, Canada |
1 |
U-Pb |
Laser ICP-MS |
Zircon |
Concordant age |
483.0 |
4.0 |
4.0 |
4.0 |
|
|
|
|
|
11 |
1.20000005 |
|
1 |
Metamorphic age |
Not classified |
BSE-images of zircons show complex internal structure with oscillatory zoned cores overgrown by thin (up to 10 µm), homogeneous zircon rims. Several grains display more than one overgrowth. Zircon LA-ICP-MS depth-profiling: Type-1 zircon overgrowths yield a concordia age of 482.6 ± 3.8 Ma (2s, MSWD = 1.2, n=11). Type-2 zircon overgrowths yield an average concordia age of 439.3 ± 3.6 Ma (2s, MSWD = 1.1, n=7). |
Walczak et al 2022b |
Walczak, K., Barnes, C.J., Majka, J., Gee, D.G. & Klonowska, I., 2022: Zircon age depth-profiling sheds light on the early Caledonian evolution of the Seve Nappe Complex in west-central Jämtland. Geoscience Frontiers 13, 101112, 1-11. |
https://doi.org/10.1016/j.gsf.2020.11.009 |
2022 |
|
xxx |
Oct 13, 2025, 10:08:57 AM |
fhm |
1 |
7011107 |
366786 |
|
|
|
19C3f |
| alder.3035 |
3035 |
|
JMY-19a |
|
Norder Tväråklumpen |
Migmatite |
Migmatitic paragneiss (microdiamond-bearing) |
|
|
|
Caledonian Orogen |
Seve Nappe Complex |
|
Stratigraphic position unknown |
University of New Brunswick’s LA–ICP–MS Laboratory, Fredericton, Canada |
1 |
U-Pb |
Laser ICP-MS |
Zircon |
Concordant age |
439.0 |
4.0 |
4.0 |
4.0 |
|
|
|
|
|
7 |
1.10000002 |
|
1 |
Metamorphic age |
Not classified |
BSE-images of zircons show complex internal structure with oscillatory zoned cores overgrown by thin (up to 10 µm), homogeneous zircon rims. Several grains display more than one overgrowth. Zircon LA-ICP-MS depth-profiling: Type-1 zircon overgrowths yield a concordia age of 482.6 ± 3.8 Ma (2s, MSWD = 1.2, n=11). Type-2 zircon overgrowths yield an average concordia age of 439.3 ± 3.6 Ma (2s, MSWD = 1.1, n=7). |
Walczak et al 2022b |
Walczak, K., Barnes, C.J., Majka, J., Gee, D.G. & Klonowska, I., 2022: Zircon age depth-profiling sheds light on the early Caledonian evolution of the Seve Nappe Complex in west-central Jämtland. Geoscience Frontiers 13, 101112, 1-11. |
https://doi.org/10.1016/j.gsf.2020.11.009 |
2022 |
|
xxx |
Oct 13, 2025, 10:35:22 AM |
fhm |
1 |
7011107 |
366786 |
|
|
|
19C3f |
| alder.3036 |
3036 |
|
|
|
Tväråklumpen |
Migmatite |
Migmatitic paragneiss |
|
|
|
Caledonian Orogen |
Seve Nappe Complex |
|
Stratigraphic position unknown |
Dionyz Stur Institute of Geology,
Bratislava, Slovak Republic |
1 |
U-Pb |
EMP U-Th total-Pb |
Monazite |
Chemical U-Th-Pb age |
445.0 |
4.0 |
4.0 |
4.0 |
|
|
|
|
|
59 |
0.82999998 |
|
1 |
Metamorphic age |
Not classified |
Chemical Th–U–Pb dating of monazite. Two microdiamond-bearing paragneiss samples from Tväråklumparna (JMY-19A, IK13-108B), yield a weighted average monazite age of 445.1 ± 3.5 Ma (2s, MSWD = 0.83, n=59). |
Klonowska et al 2017 |
Klonowska, I., Janák, M., Majka, J., Petrík, I., Froitzheim, N., Gee, D.G. & Sasinková, V., 2017: Microdiamond on Åreskutan confirms regional UHP metamorphism in the Seve Nappe Complex of the Scandinavian Caledonides. J. Metamorph. Geol., 35: 541-564. |
https://doi.org/10.1111/jmg.12244 |
2017 |
|
xxx |
Oct 13, 2025, 12:32:19 PM |
fhm |
1 |
7011107 |
366786 |
|
|
|
19C3f |
| alder.3037 |
3037 |
|
|
|
Åreskutan |
Migmatite |
Migmatitic paragneiss |
|
|
|
Caledonian Orogen |
Seve Nappe Complex |
|
Stratigraphic position unknown |
Dionyz Stur Institute of Geology,
Bratislava, Slovak Republic |
1 |
U-Pb |
EMP U-Th total-Pb |
Monazite |
Chemical U-Th-Pb age |
441.0 |
3.0 |
3.0 |
3.0 |
|
|
|
|
|
90 |
0.77999997 |
|
1 |
Metamorphic age |
Not classified |
Chemical Th–U–Pb dating of monazite. Three microdiamond-bearing paragneiss samples from Åreskutan (IK18-11, 16-11, 7-11), yield a weighted average monazite age of 441.2 ± 3.0 Ma (2s, MSWD = 0.78, n=90). |
Klonowska et al 2017 |
Klonowska, I., Janák, M., Majka, J., Petrík, I., Froitzheim, N., Gee, D.G. & Sasinková, V., 2017: Microdiamond on Åreskutan confirms regional UHP metamorphism in the Seve Nappe Complex of the Scandinavian Caledonides. J. Metamorph. Geol., 35: 541-564. |
https://doi.org/10.1111/jmg.12244 |
2017 |
|
xxx |
Oct 13, 2025, 12:32:23 PM |
fhm |
1 |
7034737 |
403697 |
|
|
|
19D7c |
| alder.3038 |
3038 |
|
|
|
Lugnåsberget |
Sandstone |
Medium-grained sandstone with clay-rich layers |
Mickwitzia sandstone member, File Haidar Formation |
|
|
Neoproterozoic and Phanerozoic platformal cover and igneous rocks |
Neoproterozoic and Phanerozoic platformal cover and igneous rocks |
|
Cambrian 0.545-0.495 Ga |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
206Pb/238U age |
550.0 |
|
|
|
|
|
|
|
285 |
|
|
|
9 |
Maximum depositional age |
Not classified |
The U–Pb concordia zircon ages from the Mickwitzia Sandstone range from c. 2.95 Ga to c. 480 Ma, dominated by Proterozoic dates, with prominent peaks centred at c. 550 Ma (with a shoulder at c. 600 Ma), 950, 1150, 1225, 1500, 1550, 1800, 2000 and 2100 Ma. Four further concordant analyses gave Archean concordia ages (c. 2,54, 2.69, 2.72, 2.95 Ga). The youngest dates in the dataset, including multiple consistent dates from single grains, indicate a maximum depositional age of c. 550 Ma. |
Slater et al 2025 |
Slater, B.J., Kenny, G.G., Budd, G.E. & Whitehouse M.J., 2025: Vast sediment dispersal in an inland sea: detrital zircon geochronology of the lower Cambrian Mickwitzia Sandstone (southern Sweden) indicates a Timanian source. Journal of the Geological Society 182, jgs2024-044, 1-9. |
https://doi.org/10.1144/jgs2024-044 |
2025 |
|
xxx |
Oct 13, 2025, 12:59:55 PM |
fhm |
1 |
6499362 |
426585 |
|
|
|
9D0f |
| alder.3039 |
3039 |
|
BA12-10 |
|
Tjeelege |
Gneiss |
Garnet gneiss |
Ankarade volcanic formation |
|
|
Caledonian Orogen |
Seve Nappe Complex |
|
Cambrian 0.545-0.495 Ga |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Concordant age |
460.0 |
3.0 |
3.0 |
3.0 |
|
|
|
|
21 |
8 |
0.021 |
0.88999999 |
1 |
Metamorphic age |
Not classified |
Zircons are subhedral to euhedral and exhibit core-rim texture. CL-dark weakly oscillatory zoned cores are surrounded by homogenous CL-light rims. Eight rim analyses yield a concordia age at 460.2 ± 2.7 Ma (2s, MSDW = 0.021), interpreted to date metamorphism. A number of analyses were discarded due to high values of common lead or discordance etc. |
Andersson 2016 |
Andersson, B., 2016: Metamorphic Evolution of the Tjeliken Garnet-Phengite Gneiss, Northern Jämtland, Swedish Caledonides (Student thesis). Examensarbete vid Institutionen för geovetenskaper nr 346, 66 pp. |
https://www.diva-portal.org/smash/get/diva2:903254/FULLTEXT01.pdf |
2016 |
|
xxx |
Oct 13, 2025, 1:57:37 PM |
fhm |
1 |
7158501 |
486428 |
|
|
|
22E2j |
| alder.3040 |
3040 |
|
KW19-06 |
|
Skalmodal |
Volcanic rock |
Meta-andesite/dacite |
Ankarade volcanic formation |
|
|
Caledonian Orogen |
Köli Nappe Complex |
|
Cambrian 0.545-0.495 Ga |
Vegacenter, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
Laser ICP-MS |
Zircon |
Concordant age |
512.0 |
4.0 |
4.0 |
4.0 |
|
|
|
|
42 |
26 |
4.9000001 |
|
5 |
Magmatic age |
Not classified |
Zircon grains are euhedral and generally display oscillatory (CL) , occasionally sector or irregular zoning. Several grains have distinctive cores.A concordia age was calculated at 512 ± 3.5 Ma (2s, MSDW = 4.9, n=26), excluding three younger analyses and one older, as well as twelve >5% discordant analyses. |
Carter 2024 |
Carter, I.S.M., 2024; Petrochronology of the Köli Nappe Complex: Investigating the tectonic evolution of Iapetus oceanic terranes in the Scandinavian Caledonides (Doctoral thesis, monograph). AGH University of Krakow, Kraków, 244 pp. |
https://uu.diva-portal.org/smash/get/diva2:1958685/FULLTEXT01.pdf |
2024 |
|
xxx |
Oct 13, 2025, 4:04:09 PM |
fhm |
1 |
7257973 |
478690 |
|
|
|
24E2i |
| alder.3041 |
3041 |
|
KW19-11 |
|
Grännsjö |
Andesite |
Meta-andesite |
Ankarade volcanic formation |
|
|
Caledonian Orogen |
Köli Nappe Complex |
|
Ordovician 0.495-0.440 Ga |
Vegacenter, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
Laser ICP-MS |
Zircon |
Concordant age |
491.0 |
3.0 |
3.0 |
3.0 |
|
|
|
|
62 |
14 |
0.27000001 |
|
5 |
Magmatic age |
Not classified |
Zircons are euhedral prismatic with oscillatory zoning. Some grains have darker cores (also oscillatory zoned) which are divided from mantles by a thin bright band. Most of the grains contain altered rims or zones, possibly metamict. 14 core analyses give a concordia age of 491 ± 3 Ma (2s, MSDW =0.27, n=14). Ages within mantles span the entire range of obtained concordant ages, and was not differentiated further |
Carter 2024 |
Carter, I.S.M., 2024; Petrochronology of the Köli Nappe Complex: Investigating the tectonic evolution of Iapetus oceanic terranes in the Scandinavian Caledonides (Doctoral thesis, monograph). AGH University of Krakow, Kraków, 244 pp. |
https://uu.diva-portal.org/smash/get/diva2:1958685/FULLTEXT01.pdf |
2024 |
|
xxx |
Oct 14, 2025, 7:21:42 AM |
fhm |
1 |
7255519 |
491005 |
|
|
|
24F1a |
| alder.3042 |
3042 |
|
KW19-12 |
|
Stornäs quarry |
Dacitoid |
Meta-dacite/rhyodacite |
Ankarade volcanic formation |
|
|
Caledonian Orogen |
Köli Nappe Complex |
|
Cambrian 0.545-0.495 Ga |
Vegacenter, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
Laser ICP-MS |
Zircon |
Concordant age |
497.0 |
2.0 |
2.0 |
2.0 |
|
|
|
|
40 |
8 |
|
|
5 |
Magmatic age |
Not classified |
Zircons are irregular, with irregular shaped, homogenous metamict cores surrounded by thin rims which are brighter in CL, and sometimes display oscillatory zoning. About a quarter of grains have euhedral prismatic shapes, and display sector zoning in CL imaging. A selection of 11 analyses give a concordia age of 497 ± 2 Ma (2s, MSDW =2, n=8), excluding >5% discordant analyses, analyses from partly metamict domains, as well as analyses with high uranium content (>900 ppm). However, all dated zircons had a relatively high U content of >610 ppm, and so may have also suffered some degree of Pb loss due to metamictisation. The age for this sample must therefore according to the author be considered with care. |
Carter 2024 |
Carter, I.S.M., 2024; Petrochronology of the Köli Nappe Complex: Investigating the tectonic evolution of Iapetus oceanic terranes in the Scandinavian Caledonides (Doctoral thesis, monograph). AGH University of Krakow, Kraków, 244 pp. |
https://uu.diva-portal.org/smash/get/diva2:1958685/FULLTEXT01.pdf |
2024 |
|
xxx |
Oct 14, 2025, 7:38:49 AM |
fhm |
1 |
7215591 |
502540 |
|
|
|
23F3c |
| alder.3043 |
3043 |
|
KW19-13 |
|
Klimpfjäll |
Andesite |
Meta-andesite |
Ankarade volcanic formation |
|
|
Caledonian Orogen |
Köli Nappe Complex |
|
Ordovician 0.495-0.440 Ga |
Vegacenter, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
Laser ICP-MS |
Zircon |
Concordant age |
488.0 |
4.0 |
4.0 |
4.0 |
|
|
|
|
42 |
14 |
2.0 |
|
5 |
Magmatic age |
Not classified |
Most zircons are euhedral prismatic with oscillatory zoning (CL). The rest are densely fractured without distinguishable zoning.The majority of grains had a >5% discordance and are probably metamict.14 analyses give a concordia age of 488 ± 4 Ma (2s, MSDW =2, n=14), excluding an older analysis (524 ± 8 Ma). |
Carter 2024 |
Carter, I.S.M., 2024; Petrochronology of the Köli Nappe Complex: Investigating the tectonic evolution of Iapetus oceanic terranes in the Scandinavian Caledonides (Doctoral thesis, monograph). AGH University of Krakow, Kraków, 244 pp. |
https://uu.diva-portal.org/smash/get/diva2:1958685/FULLTEXT01.pdf |
2024 |
|
xxx |
Oct 14, 2025, 7:53:08 AM |
fhm |
1 |
7214157 |
488485 |
|
|
|
23F3a |
| alder.3044 |
3044 |
|
IC21-11 |
|
Handöl |
Mica schist |
Garnet mica schist |
|
|
Bunnerviken Lens, Tännfors Nappes |
Caledonian Orogen |
Köli Nappe Complex |
|
Stratigraphic position unknown |
Pacific Centre for Isotopic and Geochemical Research, Department of Earth, Ocean, and Atmospheric Sciences, University of British Columbia, Canada |
10 |
Lu-Hf |
ICP-MS |
Garnet |
Isochron age |
434.0 |
6.0 |
6.0 |
6.0 |
|
|
|
|
4 |
4 |
0.31999999 |
|
1 |
Metamorphic age |
Not classified |
Garnet-whole-rock isocron age 433.6 ± 5.5 Ma (2s, MSDW =0.32, n=4). 4176Hf/177Hfinitial = 0.281748 ± 0.000008 (2s). The Lu-Hf ages were calculated using a ?176Lu of 1.867 × 10-11 yr-1 (Scherer et al. 2001; Söderlund et al. 2004). |
Carter 2024 |
Carter, I.S.M., 2024; Petrochronology of the Köli Nappe Complex: Investigating the tectonic evolution of Iapetus oceanic terranes in the Scandinavian Caledonides (Doctoral thesis, monograph). AGH University of Krakow, Kraków, 244 pp. |
https://uu.diva-portal.org/smash/get/diva2:1958685/FULLTEXT01.pdf |
2024 |
|
xxx |
Oct 14, 2025, 8:29:00 AM |
fhm |
1 |
7015701 |
371608 |
|
|
|
19C3g |
| alder.3045 |
3045 |
|
IC21-33C |
|
Saxvallen |
Schist |
Garnet bearing garben schist (garbenschiefer) |
|
|
Middagsfjället Nappe, Tännfors Nappes |
Caledonian Orogen |
Köli Nappe Complex |
|
Stratigraphic position unknown |
Pacific Centre for Isotopic and Geochemical Research, Department of Earth, Ocean, and Atmospheric Sciences, University of British Columbia, Canada |
10 |
Lu-Hf |
ICP-MS |
Garnet |
Isochron age |
428.0 |
5.0 |
5.0 |
5.0 |
|
|
|
|
4 |
4 |
0.73000002 |
|
1 |
Metamorphic age |
Not classified |
Garnet-whole-rock isocron age 427.8 ± 4.8 Ma (2s, MSDW =0.74, n=4). 176Hf/177Hfinitial = 0.281671 ± 0.000019 (2s). The Lu-Hf ages were calculated using a ?176Lu of 1.867 × 10-11 yr-1 (Scherer et al. 2001; Söderlund et al. 2004). |
Carter 2024 |
Carter, I.S.M., 2024; Petrochronology of the Köli Nappe Complex: Investigating the tectonic evolution of Iapetus oceanic terranes in the Scandinavian Caledonides (Doctoral thesis, monograph). AGH University of Krakow, Kraków, 244 pp. |
https://uu.diva-portal.org/smash/get/diva2:1958685/FULLTEXT01.pdf |
2024 |
|
xxx |
Oct 14, 2025, 8:29:04 AM |
fhm |
1 |
7047899 |
370017 |
|
|
|
20C0f |
| alder.3046 |
3046 |
|
IC21-51C |
|
Umfors |
Migmatite |
Pelitic stromatic metatexite migmatite |
|
|
Krutfjellet Nappe |
Caledonian Orogen |
Köli Nappe Complex |
|
Stratigraphic position unknown |
Institute of Geology of the Czech Academy of Sciences, Prague, Czech Republic |
9 |
U-Th_Pb |
Laser ICP-MS |
Monazite |
Concordant age |
428.0 |
1.0 |
1.0 |
1.0 |
|
|
|
|
20 |
17 |
|
|
1 |
Metamorphic age |
Not classified |
U-Pb concordia age of 428.1 ± 1.3 Ma (2s, n=17). Th-U-Pb concordia age of 427.3 ± 1.2 Ma (2s, n=14). |
Carter 2024 |
Carter, I.S.M., 2024; Petrochronology of the Köli Nappe Complex: Investigating the tectonic evolution of Iapetus oceanic terranes in the Scandinavian Caledonides (Doctoral thesis, monograph). AGH University of Krakow, Kraków, 244 pp. |
https://uu.diva-portal.org/smash/get/diva2:1958685/FULLTEXT01.pdf |
2024 |
|
xxx |
Oct 14, 2025, 8:54:40 AM |
fhm |
1 |
7315463 |
501581 |
|
|
|
25F3c |
| alder.3047 |
3047 |
|
IC21-78 |
|
Umfors, west of |
Migmatite |
Pelitic, stromatic to net-structured metatexite migmatite |
|
|
Krutfjellet Nappe |
Caledonian Orogen |
Köli Nappe Complex |
|
Stratigraphic position unknown |
Institute of Geology of the Czech Academy of Sciences, Prague, Czech Republic |
9 |
U-Th_Pb |
Laser ICP-MS |
Monazite |
Concordant age |
427.0 |
1.0 |
1.0 |
1.0 |
|
|
|
|
33 |
19 |
|
|
1 |
Metamorphic age |
Not classified |
U-Pb concordia age of 427.1 ± 1.4 Ma (2s, n=19). Th-U-Pb concordia age of 425.2 ± 1.0 Ma (2s, n=23). |
Carter 2024 |
Carter, I.S.M., 2024; Petrochronology of the Köli Nappe Complex: Investigating the tectonic evolution of Iapetus oceanic terranes in the Scandinavian Caledonides (Doctoral thesis, monograph). AGH University of Krakow, Kraków, 244 pp. |
https://uu.diva-portal.org/smash/get/diva2:1958685/FULLTEXT01.pdf |
2024 |
|
xxx |
Oct 14, 2025, 10:01:41 AM |
fhm |
1 |
7314537 |
500222 |
|
|
|
25F3c |
| alder.3048 |
3048 |
|
IC21-79 |
|
Umfors, west of |
Migmatite |
Pelitic stromatic metatexite migmatite |
|
|
Krutfjellet Nappe |
Caledonian Orogen |
Köli Nappe Complex |
|
Stratigraphic position unknown |
Institute of Geology of the Czech Academy of Sciences, Prague, Czech Republic |
9 |
U-Th_Pb |
Laser ICP-MS |
Monazite |
Concordant age |
425.0 |
2.0 |
2.0 |
2.0 |
|
|
|
|
30 |
7 |
|
|
1 |
Metamorphic age |
Not classified |
U-Pb concordia age of 425.0 ± 2.2 Ma (2s, n=7). |
Carter 2024 |
Carter, I.S.M., 2024; Petrochronology of the Köli Nappe Complex: Investigating the tectonic evolution of Iapetus oceanic terranes in the Scandinavian Caledonides (Doctoral thesis, monograph). AGH University of Krakow, Kraków, 244 pp. |
https://uu.diva-portal.org/smash/get/diva2:1958685/FULLTEXT01.pdf |
2024 |
|
xxx |
Oct 14, 2025, 10:01:45 AM |
fhm |
1 |
7314593 |
500054 |
|
|
|
25F3c |
| alder.3049 |
3049 |
|
IC21-80B |
|
Umfors, west of |
Migmatite |
Pelitic stromatic metatexite migmatite |
|
|
Krutfjellet Nappe |
Caledonian Orogen |
Köli Nappe Complex |
|
Stratigraphic position unknown |
Institute of Geology of the Czech Academy of Sciences, Prague, Czech Republic |
9 |
U-Th_Pb |
Laser ICP-MS |
Monazite |
Concordant age |
428.0 |
2.0 |
2.0 |
2.0 |
|
|
|
|
21 |
14 |
|
|
1 |
Metamorphic age |
Not classified |
U-Pb concordia age of 428.2 ± 1.7 Ma (2s, n=14). Th-U-Pb concordia age of 427.6 ± 1.4 Ma (2s, n=13). |
Carter 2024 |
Carter, I.S.M., 2024; Petrochronology of the Köli Nappe Complex: Investigating the tectonic evolution of Iapetus oceanic terranes in the Scandinavian Caledonides (Doctoral thesis, monograph). AGH University of Krakow, Kraków, 244 pp. |
https://uu.diva-portal.org/smash/get/diva2:1958685/FULLTEXT01.pdf |
2024 |
|
xxx |
Oct 14, 2025, 10:01:49 AM |
fhm |
1 |
7314637 |
499981 |
|
|
|
25F3c |
| alder.3050 |
3050 |
|
IC21-51C |
|
Umfors |
Migmatite |
Pelitic stromatic metatexite migmatite |
|
|
Krutfjellet Nappe |
Caledonian Orogen |
Köli Nappe Complex |
|
Stratigraphic position unknown |
State Geological Institute of Dionýz Štúr, Bratislava, Slovakia |
9 |
U-Th_Pb |
EMP U-Th total-Pb |
Monazite |
Weighted average age |
427.0 |
4.0 |
4.0 |
4.0 |
|
|
|
|
40 |
40 |
1.29999995 |
|
1 |
Metamorphic age |
Not classified |
427 ±3.8 Ma (MSWD=1.3, n=40) |
Carter 2024 |
Carter, I.S.M., 2024; Petrochronology of the Köli Nappe Complex: Investigating the tectonic evolution of Iapetus oceanic terranes in the Scandinavian Caledonides (Doctoral thesis, monograph). AGH University of Krakow, Kraków, 244 pp. |
https://uu.diva-portal.org/smash/get/diva2:1958685/FULLTEXT01.pdf |
2024 |
|
xxx |
Oct 14, 2025, 10:01:56 AM |
fhm |
1 |
7315463 |
501581 |
|
|
|
25F3c |
| alder.3051 |
3051 |
|
IC21-78 |
|
Umfors, west of |
Migmatite |
Pelitic, stromatic to net-structured metatexite migmatite |
|
|
Krutfjellet Nappe |
Caledonian Orogen |
Köli Nappe Complex |
|
Stratigraphic position unknown |
State Geological Institute of Dionýz Štúr, Bratislava, Slovakia |
9 |
U-Th_Pb |
EMP U-Th total-Pb |
Monazite |
Weighted average age |
443.0 |
4.0 |
4.0 |
4.0 |
|
|
|
|
44 |
44 |
0.82999998 |
|
1 |
Metamorphic age |
Not classified |
442.5 ± 4.0 Ma (MSWD=0.83, n=44); |
Carter 2024 |
Carter, I.S.M., 2024; Petrochronology of the Köli Nappe Complex: Investigating the tectonic evolution of Iapetus oceanic terranes in the Scandinavian Caledonides (Doctoral thesis, monograph). AGH University of Krakow, Kraków, 244 pp. |
https://uu.diva-portal.org/smash/get/diva2:1958685/FULLTEXT01.pdf |
2024 |
|
xxx |
Oct 14, 2025, 10:02:01 AM |
fhm |
1 |
7314537 |
500222 |
|
|
|
25F3c |
| alder.3052 |
3052 |
|
IC21-79 |
|
Umfors, west of |
Migmatite |
Pelitic stromatic metatexite migmatite |
|
|
Krutfjellet Nappe |
Caledonian Orogen |
Köli Nappe Complex |
|
Stratigraphic position unknown |
State Geological Institute of Dionýz Štúr, Bratislava, Slovakia |
9 |
U-Th_Pb |
EMP U-Th total-Pb |
Monazite |
Weighted average age |
433.0 |
3.0 |
3.0 |
3.0 |
|
|
|
|
55 |
55 |
1.29999995 |
|
1 |
Metamorphic age |
Not classified |
433.3 ± 3.0 Ma (MSWD=1.3, n=55) |
Carter 2024 |
Carter, I.S.M., 2024; Petrochronology of the Köli Nappe Complex: Investigating the tectonic evolution of Iapetus oceanic terranes in the Scandinavian Caledonides (Doctoral thesis, monograph). AGH University of Krakow, Kraków, 244 pp. |
https://uu.diva-portal.org/smash/get/diva2:1958685/FULLTEXT01.pdf |
2024 |
|
xxx |
Oct 14, 2025, 10:02:06 AM |
fhm |
1 |
7314593 |
500054 |
|
|
|
25F3c |
| alder.3053 |
3053 |
|
IC21-80B |
|
Umfors, west of |
Migmatite |
Pelitic stromatic metatexite migmatite |
|
|
Krutfjellet Nappe |
Caledonian Orogen |
Köli Nappe Complex |
|
Stratigraphic position unknown |
State Geological Institute of Dionýz Štúr, Bratislava, Slovakia |
9 |
U-Th_Pb |
EMP U-Th total-Pb |
Monazite |
Weighted average age |
438.0 |
3.0 |
3.0 |
3.0 |
|
|
|
|
55 |
55 |
2.0999999 |
|
1 |
Metamorphic age |
Not classified |
438 ± 2.7 Ma (MSWD=2.1, n=55) |
Carter 2024 |
Carter, I.S.M., 2024; Petrochronology of the Köli Nappe Complex: Investigating the tectonic evolution of Iapetus oceanic terranes in the Scandinavian Caledonides (Doctoral thesis, monograph). AGH University of Krakow, Kraków, 244 pp. |
https://uu.diva-portal.org/smash/get/diva2:1958685/FULLTEXT01.pdf |
2024 |
|
xxx |
Oct 14, 2025, 10:24:33 AM |
fhm |
1 |
7314637 |
499981 |
|
|
|
25F3c |
| alder.3054 |
3054 |
|
ML-6-12 |
|
Saxnäs (approx. coordinates from fig. 1) |
Gneiss |
Gneiss, partly migmatitic, diamondbearing |
Saxnäs gneiss |
|
|
Caledonian Orogen |
Seve Nappe Complex |
|
Stratigraphic position unknown |
State Geological Institute of Dionýz Štúr, Bratislava, Slovakia |
9 |
U-Th_Pb |
EMP U-Th total-Pb |
Monazite |
Weighted average age |
472.0 |
3.0 |
3.0 |
3.0 |
|
|
|
|
107 |
107 |
0.80000001 |
|
1 |
Metamorphic age |
Not classified |
Chemical Th–U–Pb dating of monazite. The weighted average of all single-point dates yields an age of 472.4 ± 2.6 Ma (2s, MSDW =0.80, n=107). The resulting U/Pb versus Th/Pb isochron constructed from the same set of 107 individual measurements yields the centroid age of 472.4 ± 2.8 Ma, identical to the weighted average, and with a slightly higher MSWD of 1.07. |
Petrík et al 2019 |
Petrík, I., Janák, M., Klonowska, I., Majka, J., Froitzheim, N., Yoshida, K., Sasinková, V., Konecný, P. & Vaculovic, T., 2019: Monazite Behaviour during Metamorphic Evolution of a Diamond-bearing Gneiss: a Case Study from the Seve Nappe Complex, Scandinavian Caledonides. Journal of Petrology 60, 1773–1796. |
https://doi.org/10.1093/petrology/egz051 |
2019 |
|
xxx |
Oct 14, 2025, 10:24:36 AM |
fhm |
1 |
7207730 |
509980 |
|
|
|
23F2e |
| alder.3055 |
3055 |
|
COS-108 |
|
COSC-2 borehole (359 m depth) |
Metagreywacke |
Fine grained metagreywacke with siltstone laminae |
|
Tåsjön group |
|
Caledonian Orogen |
Jämtlandian, Offerdal and Särv Nappes |
|
Ordovician 0.495-0.440 Ga |
LA-ICPMS at the Arizona LaserChron facility, Tucson, USA |
1 |
U-Pb |
Laser ICP-MS |
Zircon |
206Pb/238U age |
642.0 |
10.0 |
10.0 |
10.0 |
|
|
|
|
315 |
1 |
|
|
9 |
Maximum depositional age |
Not classified |
The detrital zircon spectrum is dominated by Mesoproterozoic to Early Neoproterozoic (76%) ages with significant early Mesoproterozoic groups at ca. 1.60 Ga, 1.56 Ga, 1.47 Ga and late Mesoproterozoic – early Neoproterozoic groups at ca. 1.15 Ga, 1.10 Ga, 1.05 Ga and 0.97 Ga. The youngest zircon grain has a 206Pb/208U age of 642 ± 10 Ma (2s). |
Ziemniak et al 2025 |
Ziemniak, G., Klonowska, I., McClelland, W.C., Lehnert, O., Cuthbert, S., Carter, I., Callegari, R. & Walczak, K., 2025: Detrital zircon geochronology of lower Palaeozoic sedimentary rocks from the COSC-2 borehole, Scandinavian Caledonides. Geoscience Frontiers 16, 102077, |
https://doi.org/10.1016/j.gsf.2025.102077 |
2025 |
|
xxx |
Oct 14, 2025, 10:35:08 AM |
fhm |
1 |
7021245 |
426167 |
|
|
|
19D4h |
| alder.3056 |
3056 |
|
COS-118 |
|
COSC-2 borehole (530 m depth) |
Metagreywacke |
Fine grained metagreywacke with siltstone laminae |
|
Tåsjön group |
|
Caledonian Orogen |
Jämtlandian, Offerdal and Särv Nappes |
|
Ordovician 0.495-0.440 Ga |
LA-ICPMS at the Arizona LaserChron facility, Tucson, USA |
1 |
U-Pb |
Laser ICP-MS |
Zircon |
206Pb/238U age |
912.0 |
7.0 |
7.0 |
7.0 |
|
|
|
|
300 |
|
|
|
9 |
Maximum depositional age |
Not classified |
The detrital zircon spectrum displays mainly Mesoproterozoic to Early Neoproterozoic (77%) ages with dominant populations at ca. 1.47 Ga, 1.15 Ga, 1.02 Ga and 0.95 Ga and subordinate populations at 2.72 Ga, 1.79 Ga and 1.38 Ga. The youngest age peak is early Neoproterozoic and the maximum age of deposition calculated via the maximum likelihood age algorithm is 912.3 ± 7.2 Ma. |
Ziemniak et al 2025 |
Ziemniak, G., Klonowska, I., McClelland, W.C., Lehnert, O., Cuthbert, S., Carter, I., Callegari, R. & Walczak, K., 2025: Detrital zircon geochronology of lower Palaeozoic sedimentary rocks from the COSC-2 borehole, Scandinavian Caledonides. |
https://doi.org/10.1016/j.gsf.2025.102077 |
2025 |
|
xxx |
Oct 14, 2025, 1:08:16 PM |
fhm |
1 |
7021245 |
426167 |
|
|
|
19D4h |
| alder.3057 |
3057 |
|
COS-119A |
|
COSC-2 borehole (847 m depth) |
Metagreywacke |
Very-fine grained metagreywacke with siltstone laminae |
|
Sjoutälven Group |
|
Caledonian Orogen |
Neoproterozoic and Phanerozoic platformal cover and igneous rocks |
|
Cambrian 0.545-0.495 Ga |
LA-ICPMS at the Arizona LaserChron facility, Tucson, USA |
1 |
U-Pb |
Laser ICP-MS |
Zircon |
206Pb/238U age |
531.0 |
4.0 |
4.0 |
4.0 |
|
|
|
|
262 |
|
|
|
9 |
Maximum depositional age |
Not classified |
The detrital zircon age spectrum spans Archean to Cambrian ages. The Archean grains (12%) are dominated by a ca. 2.67 Ga popula-tion. The Paleoproterozoic (25%) population is dominated by ca. 2.12 Ga, 1.80 Ga, 1.76 Ga and 1.64 Ga age peaks. Mesoproterozoic grains (41%) show two dominant populations at ca. 1.53 Ga and 1.20 Ga. The Cryogenian-Ediacaran grains (16%) display 0.72 Ga, 0.60 Ga and 0.53 Ga age peaks. The youngest age peak is lower Cambrian and the maximum age of deposition calculated via the maximum likelihood age algorithm is 530.5 ± 4 Ma. |
Ziemniak et al 2025 |
Ziemniak, G., Klonowska, I., McClelland, W.C., Lehnert, O., Cuthbert, S., Carter, I., Callegari, R. & Walczak, K., 2025: Detrital zircon geochronology of lower Palaeozoic sedimentary rocks from the COSC-2 borehole, Scandinavian Caledonides. |
https://doi.org/10.1016/j.gsf.2025.102077 |
2025 |
|
xxx |
Oct 14, 2025, 1:08:20 PM |
fhm |
1 |
7021245 |
426167 |
|
|
|
19D4h |
| alder.3058 |
3058 |
|
COS-127 |
|
COSC-2 borehole (1018 m depth) |
Metagreywacke |
Fine grained metagreywacke |
|
Sjoutälven Group |
|
Neoproterozoic and Phanerozoic platformal cover and igneous rocks |
Neoproterozoic and Phanerozoic platformal cover and igneous rocks |
|
Cambrian-Ordovician 0.545-0.440 Ga |
LA-ICPMS at the Arizona LaserChron facility, Tucson, USA |
1 |
U-Pb |
Laser ICP-MS |
Zircon |
206Pb/238U age |
604.0 |
8.0 |
8.0 |
8.0 |
|
|
|
|
292 |
1 |
|
|
9 |
Maximum depositional age |
Not classified |
The detrital zircon spectrum displays late Paleoproterozoic (62%), Mesoproterozoic (21%) and Archean (11%) ages. The dominant populations are ca. 1.87 Ga and 1.79 Ga with subordinate populations at 2.71 Ga, 1.97 Ga, 1.70 Ga and 1.45 Ga. The single youngest grain has a 206Pb/208U age of 604 ± 8 Ma (2s). |
Ziemniak et al 2025 |
Ziemniak, G., Klonowska, I., McClelland, W.C., Lehnert, O., Cuthbert, S., Carter, I., Callegari, R. & Walczak, K., 2025: Detrital zircon geochronology of lower Palaeozoic sedimentary rocks from the COSC-2 borehole, Scandinavian Caledonides. |
https://doi.org/10.1016/j.gsf.2025.102077 |
2025 |
|
xxx |
Oct 14, 2025, 1:08:24 PM |
fhm |
1 |
7021245 |
426167 |
|
|
|
19D4h |
| alder.3059 |
3059 |
|
COS-143 |
|
COSC-2 borehole (1180 m depth) |
Arkose |
Arkose, weakly metamorphosed, composed mainly of medium to coarse clasts of monocrystalline quartz, microcline and plagioclase |
|
Sjoutälven group |
|
Neoproterozoic and Phanerozoic platformal cover and igneous rocks |
Neoproterozoic and Phanerozoic platformal cover and igneous rocks |
|
Cambrian-Ordovician 0.545-0.440 Ga |
LA-ICPMS at the Arizona LaserChron facility, Tucson, USA |
1 |
U-Pb |
Laser ICP-MS |
Zircon |
206Pb/238U age |
734.0 |
8.0 |
8.0 |
8.0 |
|
|
|
|
292 |
1 |
|
|
9 |
Maximum depositional age |
Not classified |
The detrital zircon spectrum is dominated by late Paleo-proterozoic (47%) to Mesoproterozoic (52%) ages. age signature is characterised by peaks at ca. 1.77 Ga, 1.67 Ga, 1.56 Ga and 1.44 Ga with a subordinate population at 1.25 Ga. The youngest grain has a 206Pb/208U age of 737 ± 8 Ma (2s). |
Ziemniak et al 2025 |
Ziemniak, G., Klonowska, I., McClelland, W.C., Lehnert, O., Cuthbert, S., Carter, I., Callegari, R. & Walczak, K., 2025: Detrital zircon geochronology of lower Palaeozoic sedimentary rocks from the COSC-2 borehole, Scandinavian Caledonides. |
https://doi.org/10.1016/j.gsf.2025.102077 |
2025 |
|
xxx |
Oct 14, 2025, 1:08:28 PM |
fhm |
1 |
7021245 |
426167 |
|
|
|
19D4h |
| alder.3060 |
3060 |
|
|
|
COSC-2 borehole (1665, 1672, 1684 meters depth) |
Gabbro |
Two samples of undeformed coarse gabbro with sub-ophitic texture and third sample of a coarse- to medium-grained gabbro. |
|
Central Scandinavian Dolerite Group |
|
Post-Svecokarelian, Proterozoic rocks |
Post-Svecokarelian, Proterozoic rocks |
|
Intrusive rock c. 1.27-1.20 Ga |
|
1 |
U-Pb |
ID-TIMS |
Baddeleyite |
Not known |
|
|
|
|
1260.0 |
1270.0 |
|
|
|
|
|
|
5 |
Magmatic age |
Not classified |
U-Pb geochronology on baddeleyite from three samples fall in the 1.27–1.26 Ga age range. |
Lescoutre 2022 |
Lescoutre, R., Söderlund, U., Anderssona,J. & Almqvist, B., 2022: 1.47 Ga and 1.27–1.26 Ga dolerite sheets within the basement underneath the east-central Scandinavian Caledonides. In: GFF 150 Anniversary Meeting, pp. 433–444. |
https://geologiskaforeningen.se/wp-content/uploads/2022/08/GF_SP1_2022_abstract-volume_w-errata.pdf |
2022 |
|
xxx |
Oct 14, 2025, 1:30:30 PM |
fhm |
1 |
7021245 |
426167 |
|
|
|
19D4h |
| alder.3061 |
3061 |
|
|
|
COSC-2 borehole (1879 meters depth) |
Doleritic rock |
Medium-grained dolerite with well-developed subophitic texture |
|
|
|
Post-Svecokarelian, Proterozoic rocks |
Post-Svecokarelian, Proterozoic rocks |
|
Intrusive rock c. 1.46-1.29 Ga |
|
1 |
U-Pb |
ID-TIMS |
Baddeleyite |
Not known |
1470.0 |
|
|
|
|
|
|
|
|
|
|
|
5 |
Magmatic age |
Not classified |
Dolerite preliminarily dated to c. 1.47 Ga. |
Lescoutre 2022 |
Lescoutre, R., Söderlund, U., Anderssona,J. & Almqvist, B., 2022: 1.47 Ga and 1.27–1.26 Ga dolerite sheets within the basement underneath the east-central Scandinavian Caledonides. In: GFF 150 Anniversary Meeting, pp. 433–444. |
https://geologiskaforeningen.se/wp-content/uploads/2022/08/GF_SP1_2022_abstract-volume_w-errata.pdf |
2022 |
|
xxx |
Oct 14, 2025, 3:29:08 PM |
fhm |
1 |
7021245 |
426167 |
|
|
|
19D4h |
| alder.3062 |
3062 |
|
|
|
COSC-2 borehole (1230 meters depth) |
Felsic volcanic rock |
Felsic porphyry |
|
|
|
Post-Svecokarelian, Proterozoic rocks |
Post-Svecokarelian, Proterozoic rocks |
|
Supracrustal rock c. 1.66-1.61 Ga |
|
1 |
U-Pb |
Not known |
Zircon |
Not known |
1651.0 |
4.0 |
4.0 |
4.0 |
|
|
|
|
|
|
|
|
5 |
Magmatic age |
Not classified |
Felsic porphyry in the presumably autochthonous basement underlying the Caledonian nappes was sampled at c. 1230 m depth in the COSC-2 drill core from the bore hole at the southern shore of Lake Liten, southeast of Järpen in Jämtland, dated at 1651±4 Ma (U-Pb zircon). |
Andersson et al 2022b |
Andersson, J., Claesson, S.& Kooijman, E., 2022: Age and crustal affinity of Precambrian basement nappes and underlying basement in the east central Scandinavian Caledonides. In: GFF 150 Anniversary Meeting, pp. 426–427. |
https://geologiskaforeningen.se/wp-content/uploads/2022/08/GF_SP1_2022_abstract-volume_w-errata.pdf |
2022 |
|
xxx |
Oct 14, 2025, 3:39:21 PM |
fhm |
1 |
7021245 |
426167 |
|
|
|
19D4h |
| alder.3063 |
3063 |
|
|
|
COSC-2 borehole (1400 meters depth) |
Felsic volcanic rock |
Felsic porphyry |
|
|
|
Post-Svecokarelian, Proterozoic rocks |
Post-Svecokarelian, Proterozoic rocks |
|
Supracrustal rock c. 1.66-1.61 Ga |
|
1 |
U-Pb |
Not known |
Zircon |
Not known |
1660.0 |
4.0 |
4.0 |
4.0 |
|
|
|
|
|
|
|
|
5 |
Magmatic age |
Not classified |
Felsic porphyry in the presumably autochthonous basement underlying the Caledonian nappes was sampled at c. 1400 m depth in the COSC-2 drill core from the bore hole at the southern shore of Lake Liten, southeast of Järpen in Jämtland, dated at 1660±4 Ma (U-Pb zircon). |
Andersson et al 2022b |
Andersson, J., Claesson, S.& Kooijman, E., 2022: Age and crustal affinity of Precambrian basement nappes and underlying basement in the east central Scandinavian Caledonides. In: GFF 150 Anniversary Meeting, pp. 426–427. |
https://geologiskaforeningen.se/wp-content/uploads/2022/08/GF_SP1_2022_abstract-volume_w-errata.pdf |
2022 |
|
xxx |
Oct 14, 2025, 3:52:44 PM |
fhm |
1 |
7021245 |
426167 |
|
|
|
19D4h |
| alder.3064 |
3064 |
|
|
|
COSC-2 borehole (2250 meters depth) |
Felsic volcanic rock |
Felsic porphyry |
|
|
|
Post-Svecokarelian, Proterozoic rocks |
Post-Svecokarelian, Proterozoic rocks |
|
Supracrustal rock c. 1.66-1.61 Ga |
|
1 |
U-Pb |
Not known |
Zircon |
Not known |
1654.0 |
4.0 |
4.0 |
4.0 |
|
|
|
|
|
|
|
|
5 |
Magmatic age |
Not classified |
Felsic porphyry in the presumably autochthonous basement underlying the Caledonian nappes was sampled at c. 2250 m depth in the COSC-2 drill core from the bore hole at the southern shore of Lake Liten, southeast of Järpen in Jämtland, dated at 1654±4 Ma (U-Pb zircon). |
Andersson et al 2022b |
Andersson, J., Claesson, S.& Kooijman, E., 2022: Age and crustal affinity of Precambrian basement nappes and underlying basement in the east central Scandinavian Caledonides. In: GFF 150 Anniversary Meeting, pp. 426–427. |
https://geologiskaforeningen.se/wp-content/uploads/2022/08/GF_SP1_2022_abstract-volume_w-errata.pdf |
2022 |
|
xxx |
Oct 14, 2025, 3:52:50 PM |
fhm |
1 |
7021245 |
426167 |
|
|
|
19D4h |
| alder.3065 |
3065 |
|
COS31 |
n7014 |
COSC-2 borehole ((1643.6 m depth) |
Doleritic rock |
Dolerite |
|
|
|
Post-Svecokarelian, Proterozoic rocks |
Post-Svecokarelian, Proterozoic rocks |
|
Intrusive rock c. 1.27-1.20 Ga |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Concordant age |
1278.0 |
14.0 |
14.0 |
14.0 |
|
|
|
|
4 |
2 |
0.87 |
0.11 |
5 |
Magmatic age |
Not classified |
Analyses yielded a a concordia age of 1278.4±14 Ma (MSWD of conc. = 0.87; probality of conc. = 0.11, n=2). Two analyses were excluded, one shows a slightly older age of 1319±44 Ma and the other one is discordant with a high amount of common lead. |
Rosén 2025 |
Rosén, L., 2025: U-Pb Analysis on Zircon From the COSC-2 Drill Core in Central Jämtland, Sweden (Student thesis). Självständigt arbete vid Institutionen för geovetenskaper Uppsala universitet, 22 pp. |
https://uu.diva-portal.org/smash/get/diva2:1963147/FULLTEXT01.pdf |
2025 |
|
xxx |
Oct 14, 2025, 4:05:53 PM |
fhm |
1 |
7021245 |
426167 |
|
|
|
19D4h |
| alder.3066 |
3066 |
|
JA05 |
n7013 |
COSC-2 borehole ((1671.1 m depth) |
Doleritic rock |
Dolerite |
|
|
|
Post-Svecokarelian, Proterozoic rocks |
Post-Svecokarelian, Proterozoic rocks |
|
Intrusive rock c. 1.27-1.20 Ga |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Concordant age |
1268.0 |
7.0 |
7.0 |
7.0 |
|
|
|
|
11 |
11 |
0.47 |
0.5 |
5 |
Magmatic age |
Not classified |
The zircon grains are 10-250 µm, appear fragmented, with no well-formed crystals preserved. BSE images of zircons show no evidence of zoning. Analyses yielded a a concordia age of 1268.4±7.0 Ma (MSWD of conc. = 0.47; probality of conc. = 0.50, n=11). The weighted 207Pb/206Pb mean age is 1266 ± 10 Ma (MSWD = 0.87, prob. = 0.56). |
Rosén 2025 |
Rosén, L., 2025: U-Pb Analysis on Zircon From the COSC-2 Drill Core in Central Jämtland, Sweden (Student thesis). Självständigt arbete vid Institutionen för geovetenskaper Uppsala universitet, 22 pp. |
https://uu.diva-portal.org/smash/get/diva2:1963147/FULLTEXT01.pdf |
2025 |
|
xxx |
Oct 14, 2025, 5:07:46 PM |
fhm |
1 |
7021245 |
426167 |
|
|
|
19D4h |
| alder.3067 |
3067 |
|
VAI 6 |
|
Vuoggatjålme |
Eclogite |
Eclogite |
|
|
Vaimok Nappe |
Caledonian Orogen |
Seve Nappe Complex |
|
Stratigraphic position unknown |
Cologne-Bonn isotope facility |
10 |
Lu-Hf |
ICP-MS |
Multi mineral |
Isochron age |
480.0 |
1.0 |
1.0 |
1.0 |
|
|
|
|
6 |
6 |
0.61000001 |
|
1 |
Metamorphic age |
Not classified |
For sample VAI 6 four garnet separates, one tabletop-digested whole-rock split and one bomb-digested whole-rock split were analysed. All six separates yield an age of 480.4 ± 1.2 Ma (MSWD = 0.61, n = 6). A decay constant of ?176Lu = 1.867 × 10–11 a-1 (Scherer et al. 2001; Söderlund et al. 2004) and 2 s uncertainties for 176Lu/177Hf and 176Hf/177Hf ratios were used for isochron calculations. |
Fassmer et al 2020 |
Fassmer, K., Froitzheim, N., Janák, M., Strohmeyer, M., Bukala, M., Lagos, M. & Münker, C., 2021: Diachronous collision in the Seve Nappe Complex: Evidence from Lu–Hf geochronology of eclogites (Norrbotten, North Sweden). Journal of Metamorphic Geology 39, 819–842. |
https://doi.org/10.1111/jmg.12591 |
2020 |
|
xxx |
Oct 15, 2025, 9:20:05 AM |
fhm |
1 |
7385397 |
563724 |
|
|
|
26G7f |
| alder.3068 |
3068 |
|
TS 1706 |
|
Tsäkkok |
Eclogite |
Eclogite |
|
|
Tsäkkok Nappe |
Caledonian Orogen |
Seve Nappe Complex |
|
Stratigraphic position unknown |
Cologne-Bonn isotope facility |
10 |
Lu-Hf |
ICP-MS |
Multi mineral |
Isochron age |
485.0 |
5.0 |
5.0 |
5.0 |
|
|
|
|
|
|
1.89999998 |
|
1 |
Metamorphic age |
Not classified |
For sample TS 1706 one clinopyroxene separate, four garnet separates and three whole-rock splits (one bomb-and two tabletop digested) were analysed. All of the measured separates yield an age of 484.6 ± 4.6 Ma (MSWD = 1.9, n = 8). A decay constant of ?176Lu = 1.867 × 10–11 a-1 (Scherer et al. 2001; Söderlund et al. 2004) and 2 s uncertainties for 176Lu/177Hf and 176Hf/177Hf ratios were used for isochron calculations. |
Fassmer et al 2020 |
Fassmer, K., Froitzheim, N., Janák, M., Strohmeyer, M., Bukala, M., Lagos, M. & Münker, C., 2021: Diachronous collision in the Seve Nappe Complex: Evidence from Lu–Hf geochronology of eclogites (Norrbotten, North Sweden). Journal of Metamorphic Geology 39, 819–842. |
https://doi.org/10.1111/jmg.12591 |
2020 |
|
xxx |
Oct 15, 2025, 9:20:20 AM |
fhm |
1 |
7445303 |
569651 |
|
|
|
27G9g |
| alder.3069 |
3069 |
|
TS 2 |
|
Basskajávrre |
Eclogite |
Eclogite |
|
|
Tsäkkok Nappe |
Caledonian Orogen |
Seve Nappe Complex |
|
Stratigraphic position unknown |
Cologne-Bonn isotope facility |
10 |
Lu-Hf |
ICP-MS |
Multi mineral |
Isochron age |
488.0 |
5.0 |
5.0 |
5.0 |
|
|
|
|
7 |
7 |
0.44 |
|
1 |
Metamorphic age |
Not classified |
Four garnet separates, one clinopyroxene separate, and two whole-rock splits were analysed for sample TS 2. An isochron gives an age of 487.7 ± 4.6 Ma (MSWD = 0.44, n = 7). A decay constant of 176Lu = 1.867 × 10–11 a-1 (Scherer et al. 2001; Söderlund et al. 2004) and 2 s uncertainties for 176Lu/177Hf and 176Hf/177Hf ratios were used for isochron calculations. |
Fassmer et al 2020 |
Fassmer, K., Froitzheim, N., Janák, M., Strohmeyer, M., Bukala, M., Lagos, M. & Münker, C., 2021: Diachronous collision in the Seve Nappe Complex: Evidence from Lu–Hf geochronology of eclogites (Norrbotten, North Sweden). Journal of Metamorphic Geology 39, 819–842. |
https://doi.org/10.1111/jmg.12591 |
2020 |
|
xxx |
Oct 15, 2025, 9:20:27 AM |
fhm |
1 |
7445667 |
583573 |
|
|
|
27G9j |
| alder.3070 |
3070 |
|
TS 1764 |
|
Basskajávrre |
Eclogite |
Eclogite |
|
|
Tsäkkok Nappe |
Caledonian Orogen |
Seve Nappe Complex |
|
Stratigraphic position unknown |
Cologne-Bonn isotope facility |
10 |
Lu-Hf |
ICP-MS |
Multi mineral |
Isochron age |
486.0 |
3.0 |
3.0 |
3.0 |
|
|
|
|
|
|
0.54000002 |
|
1 |
Metamorphic age |
Not classified |
Four garnet separates, one clinopyroxene separate, one bomb-digested whole-rock split and one tabletop-digested whole-rock split were measured from sample TS 1764.The isochron yield an age of 486.2 ± 3.2 Ma (MSWD = 0.54, n = 7).A decay constant of ?176Lu = 1.867 × 10–11 a-1 (Scherer et al. 2001; Söderlund et al. 2004) and 2 s uncertainties for 176Lu/177Hf and 176Hf/177Hf ratios were used for isochron calculations. |
Fassmer et al 2020 |
Fassmer, K., Froitzheim, N., Janák, M., Strohmeyer, M., Bukala, M., Lagos, M. & Münker, C., 2021: Diachronous collision in the Seve Nappe Complex: Evidence from Lu–Hf geochronology of eclogites (Norrbotten, North Sweden). Journal of Metamorphic Geology 39, 819–842. |
https://doi.org/10.1111/jmg.12591 |
2020 |
|
xxx |
Oct 15, 2025, 9:20:33 AM |
fhm |
1 |
7445708 |
584830 |
|
|
|
27G9j |
| alder.3071 |
3071 |
|
CC1:537 |
|
Mora, Borehole CC1 (537 m depth) |
Hydrothermal vein or fracture filling |
Calcite occurs together with sulfides and bitumen in secondary mineral coatings of open fractures. Wallrock of Proterozoic granite. |
|
|
|
Unknown |
unknown |
|
Stratigraphic position unknown |
Geochronology & Tracers Facility, NERC Isotope Geosciences Laboratory, Nottingham, UK |
1 |
U-Pb |
Laser ICP-MS |
Calcite |
Upper intercept age |
39.0 |
1.0 |
1.0 |
1.0 |
|
|
|
|
|
|
2.0999999 |
|
8 |
Mineralisation age |
Not classified |
U-Pb carbonate dating. CC1:537, 13C-rich calcite, in granite fracture, yielding 39.2 ± 1.4 Ma (2s, MSWD = 2.1). |
Drake et al 2019 |
Drake, H., Roberts, N.M.W., Heim, C., Whitehouse, M.J., Siljeström, S., Kooijman, E., Broman, C., Ivarsson, M. & Åström, M.E., 2019: Timing and origin of natural gas accumulation in the Siljan impact structure, Sweden. Nature Communications 10, 4736, 1-14. |
https://www.nature.com/articles/s41467-019-12728-y |
2019 |
|
xxx |
Oct 16, 2025, 7:04:32 AM |
fhm |
1 |
6762143 |
472879 |
|
|
|
14E2f |
| alder.3072 |
3072 |
|
VM1:255 younger |
|
Mora, Borehole VM1 (255 m depth) |
Hydrothermal vein or fracture filling |
Calcite occurs together with sulfides and bitumen in secondary mineral coatings of open fractures. Wallrock of Proterozoic granite. |
|
|
|
Unknown |
unknown |
|
Stratigraphic position unknown |
Geochronology & Tracers Facility, NERC Isotope Geosciences Laboratory, Nottingham, UK |
1 |
U-Pb |
Laser ICP-MS |
Calcite |
Upper intercept age |
38.0 |
2.0 |
2.0 |
2.0 |
|
|
|
|
|
|
0.92000002 |
|
8 |
Mineralisation age |
Not classified |
U-Pb carbonate dating. VM1:255, 13C-depleted calcite in granite fracture (targeting the growth zones with dark BSE-intensity), yielding 37.7 ± 1.9 Ma (2s, MSWD = 0.92) , with an older potential event 464 ± 60 Ma (2s, MSWD = 0.079) highly uncertain: only three data points). |
Drake et al 2019 |
Drake, H., Roberts, N.M.W., Heim, C., Whitehouse, M.J., Siljeström, S., Kooijman, E., Broman, C., Ivarsson, M. & Åström, M.E., 2019: Timing and origin of natural gas accumulation in the Siljan impact structure, Sweden. Nature Communications 10, 4736, 1-14. |
https://www.nature.com/articles/s41467-019-12728-y |
2019 |
|
xxx |
Oct 16, 2025, 7:04:37 AM |
fhm |
1 |
6760739 |
474690 |
|
|
|
14E2g |
| alder.3073 |
3073 |
|
VM1:255 older |
|
Mora, Borehole VM1 (255 m depth) |
Hydrothermal vein or fracture filling |
Calcite occurs together with sulfides and bitumen in secondary mineral coatings of open fractures. Wallrock of Proterozoic granite. |
|
|
|
Unknown |
unknown |
|
Stratigraphic position unknown |
Geochronology & Tracers Facility, NERC Isotope Geosciences Laboratory, Nottingham, UK |
1 |
U-Pb |
Laser ICP-MS |
Calcite |
Upper intercept age |
464.0 |
60.0 |
60.0 |
60.0 |
|
|
|
|
|
3 |
0.079 |
|
8 |
Mineralisation age |
Not classified |
U-Pb carbonate dating. VM1:255, 13C-depleted calcite in granite fracture (targeting the growth zones with dark BSE-intensity), yielding 37.7 ± 1.9 Ma (2s, MSWD = 0.92) , with an older potential event 464 ± 60 Ma (2s, MSWD = 0.079) highly uncertain: only three data points). |
Drake et al 2019 |
Drake, H., Roberts, N.M.W., Heim, C., Whitehouse, M.J., Siljeström, S., Kooijman, E., Broman, C., Ivarsson, M. & Åström, M.E., 2019: Timing and origin of natural gas accumulation in the Siljan impact structure, Sweden. Nature Communications 10, 4736, 1-14. |
https://www.nature.com/articles/s41467-019-12728-y |
2019 |
|
xxx |
Oct 16, 2025, 7:40:22 AM |
fhm |
1 |
6760739 |
474690 |
|
|
|
14E2g |
| alder.3074 |
3074 |
|
VM1:442 |
|
Mora, Borehole VM1 (442 m depth) |
Hydrothermal vein or fracture filling |
Calcite occurs together with sulfides and bitumen in secondary mineral coatings of open fractures. Wallrock of Proterozoic granite. |
|
|
|
Unknown |
unknown |
|
Stratigraphic position unknown |
Geochronology & Tracers Facility, NERC Isotope Geosciences Laboratory, Nottingham, UK |
1 |
U-Pb |
Laser ICP-MS |
Calcite |
Upper intercept age |
65.0 |
10.0 |
10.0 |
10.0 |
|
|
|
|
|
|
2.0999999 |
|
8 |
Mineralisation age |
Not classified |
U-Pb carbonate dating. VM1:442, 13C-rich calcite in granite fracture, yielding 65 ± 10 Ma (2s, MSWD = 2.1) |
Drake et al 2019 |
Drake, H., Roberts, N.M.W., Heim, C., Whitehouse, M.J., Siljeström, S., Kooijman, E., Broman, C., Ivarsson, M. & Åström, M.E., 2019: Timing and origin of natural gas accumulation in the Siljan impact structure, Sweden. Nature Communications 10, 4736, 1-14. |
https://www.nature.com/articles/s41467-019-12728-y |
2019 |
|
xxx |
Oct 16, 2025, 7:40:27 AM |
fhm |
1 |
6760739 |
474690 |
|
|
|
14E2g |
| alder.3075 |
3075 |
|
VM2:170 B+C+D+F |
|
Mora, Borehole VM2 (170 m depth) |
Hydrothermal vein or fracture filling |
Calcite occurs together with sulfides and bitumen in secondary mineral coatings of open fractures. Wallrock of Ordovician limestone. |
|
|
|
Unknown |
unknown |
|
Stratigraphic position unknown |
Geochronology & Tracers Facility, NERC Isotope Geosciences Laboratory, Nottingham, UK |
1 |
U-Pb |
Laser ICP-MS |
Calcite |
Upper intercept age |
80.0 |
5.0 |
5.0 |
5.0 |
|
|
|
|
|
|
3.0 |
|
8 |
Mineralisation age |
Not classified |
U-Pb carbonate dating. VM2:170, two generations of 13C-rich calcite in limestone fracture, yielding ages 80 ± 5 Ma (2s, MSWD = 3) and 39 ± 3 Ma (2s, MSWD = 10.8). |
Drake et al 2019 |
Drake, H., Roberts, N.M.W., Heim, C., Whitehouse, M.J., Siljeström, S., Kooijman, E., Broman, C., Ivarsson, M. & Åström, M.E., 2019: Timing and origin of natural gas accumulation in the Siljan impact structure, Sweden. Nature Communications 10, 4736, 1-14. |
https://www.nature.com/articles/s41467-019-12728-y |
2019 |
|
xxx |
Oct 16, 2025, 7:40:31 AM |
fhm |
1 |
6760433 |
474264 |
|
|
|
14E2g |
| alder.3076 |
3076 |
|
VM2:170 A+E+G |
|
Mora, Borehole VM2 (170 m depth) |
Hydrothermal vein or fracture filling |
Calcite occurs together with sulfides and bitumen in secondary mineral coatings of open fractures. Wallrock of Ordovician limestone. |
|
|
|
Unknown |
unknown |
|
Stratigraphic position unknown |
Geochronology & Tracers Facility, NERC Isotope Geosciences Laboratory, Nottingham, UK |
1 |
U-Pb |
Laser ICP-MS |
Calcite |
Upper intercept age |
39.0 |
3.0 |
3.0 |
3.0 |
|
|
|
|
|
|
10.80000019 |
|
8 |
Mineralisation age |
Not classified |
U-Pb carbonate dating. VM2:170, two generations of 13C-rich calcite in limestone fracture, yielding ages 80 ± 5 Ma (2s, MSWD = 3) and 39 ± 3 Ma (2s, MSWD = 10.8). |
Drake et al 2019 |
Drake, H., Roberts, N.M.W., Heim, C., Whitehouse, M.J., Siljeström, S., Kooijman, E., Broman, C., Ivarsson, M. & Åström, M.E., 2019: Timing and origin of natural gas accumulation in the Siljan impact structure, Sweden. Nature Communications 10, 4736, 1-14. |
https://www.nature.com/articles/s41467-019-12728-y |
2019 |
|
xxx |
Oct 16, 2025, 7:40:37 AM |
fhm |
1 |
6760433 |
474264 |
|
|
|
14E2g |
| alder.3077 |
3077 |
|
VM2:212 |
|
Mora, Borehole VM2 (212 m depth) |
Hydrothermal vein or fracture filling |
Calcite occurs together with sulfides and bitumen in secondary mineral coatings of open fractures. Wallrock of Ordovician limestone. |
|
|
|
Unknown |
unknown |
|
Stratigraphic position unknown |
Geochronology & Tracers Facility, NERC Isotope Geosciences Laboratory, Nottingham, UK |
1 |
U-Pb |
Laser ICP-MS |
Calcite |
Upper intercept age |
22.0 |
3.0 |
3.0 |
3.0 |
|
|
|
|
|
|
1.20000005 |
|
8 |
Mineralisation age |
Not classified |
U-Pb carbonate dating. VM2:212 13C-rich calcite in limestone fracture, yielding 22.2 ± 2.5 Ma (2s, MSWD = 1.2). |
Drake et al 2019 |
Drake, H., Roberts, N.M.W., Heim, C., Whitehouse, M.J., Siljeström, S., Kooijman, E., Broman, C., Ivarsson, M. & Åström, M.E., 2019: Timing and origin of natural gas accumulation in the Siljan impact structure, Sweden. Nature Communications 10, 4736, 1-14. |
https://www.nature.com/articles/s41467-019-12728-y |
2019 |
|
xxx |
Oct 16, 2025, 7:40:43 AM |
fhm |
1 |
6760433 |
474264 |
|
|
|
14E2g |
| alder.3078 |
3078 |
|
VM2:429 |
|
Mora, Borehole VM2 (429 m depth) |
Hydrothermal vein or fracture filling |
Calcite occurs together with sulfides and bitumen in secondary mineral coatings of open fractures. Wallrock of Proterozoic granite. |
|
|
|
Unknown |
unknown |
|
Stratigraphic position unknown |
Geochronology & Tracers Facility, NERC Isotope Geosciences Laboratory, Nottingham, UK |
1 |
U-Pb |
Laser ICP-MS |
Calcite |
Upper intercept age |
506.0 |
25.0 |
25.0 |
25.0 |
|
|
|
|
|
|
24.0 |
|
8 |
Mineralisation age |
Not classified |
U-Pb carbonate dating. Calcite without any significant excursions in d13Ccalcite values (-3.9 to +0.8‰) from two granite fracture samples yielded 506 ± 25 (2s, MSWD = 24) and 576 ± 64 Ma (2s, MSWD = 24) ages. |
Drake et al 2019 |
Drake, H., Roberts, N.M.W., Heim, C., Whitehouse, M.J., Siljeström, S., Kooijman, E., Broman, C., Ivarsson, M. & Åström, M.E., 2019: Timing and origin of natural gas accumulation in the Siljan impact structure, Sweden. Nature Communications 10, 4736, 1-14. |
https://www.nature.com/articles/s41467-019-12728-y |
2019 |
|
xxx |
Oct 16, 2025, 7:40:59 AM |
fhm |
1 |
6760433 |
474264 |
|
|
|
14E2g |
| alder.3079 |
3079 |
|
VM2:642 |
|
Mora, Borehole VM2 (642 m depth) |
Hydrothermal vein or fracture filling |
Calcite occurs together with sulfides and bitumen in secondary mineral coatings of open fractures. Wallrock of Proterozoic granite. |
|
|
|
Unknown |
unknown |
|
Stratigraphic position unknown |
Geochronology & Tracers Facility, NERC Isotope Geosciences Laboratory, Nottingham, UK |
1 |
U-Pb |
Laser ICP-MS |
Calcite |
Upper intercept age |
576.0 |
64.0 |
64.0 |
64.0 |
|
|
|
|
|
|
22.0 |
|
8 |
Mineralisation age |
Not classified |
U-Pb carbonate dating. Calcite without any significant excursions in d13Ccalcite values (-3.9 to +0.8‰) from two granite fracture samples yielded 506 ± 25 (2s, MSWD = 24) and 576 ± 64 Ma (2s, MSWD = 24) ages. |
Drake et al 2019 |
Drake, H., Roberts, N.M.W., Heim, C., Whitehouse, M.J., Siljeström, S., Kooijman, E., Broman, C., Ivarsson, M. & Åström, M.E., 2019: Timing and origin of natural gas accumulation in the Siljan impact structure, Sweden. Nature Communications 10, 4736, 1-14. |
https://www.nature.com/articles/s41467-019-12728-y |
2019 |
|
xxx |
Oct 16, 2025, 7:41:12 AM |
fhm |
1 |
6760433 |
474264 |
|
|
|
14E2g |
| alder.3080 |
3080 |
|
KFM04A:306 m |
|
Forsmark, Borehole KFM04A (306 m depth) |
Hydrothermal vein or fracture filling |
Fracture with adularia and calcite etc |
|
|
|
Svecokarelian Orogen |
Bergslagen lithotectonic unit |
|
Stratigraphic position unknown |
Microgeochemistry Laboratory, Department of Earth Sciences, University of Gothenburg |
2 |
Rb-Sr |
Laser ICP-MS |
Multi mineral |
Isochron age |
355.0 |
14.0 |
14.0 |
14.0 |
|
|
|
|
|
8 |
0.36000001 |
|
8 |
Mineralisation age |
Not classified |
Rb/Sr isochrons of co-genetic adularia and calcite yield an age of 355 ± 14 Ma (2s, MSWD = 0.36, n =8). |
Drake et al 2017 |
Drake, H., Heim, C., Roberts, N.M.W., Zack, T., Tillberg, M., Broman, C., Ivarsson, M., Whitehouse, M.J. & Åström, M.E., 2017: Isotopic evidence for microbial production and consumption of methane in the upper continental crust throughout the Phanerozoic eon. Earth and Planetary Science Letters 470, 108–118. |
http://dx.doi.org/10.1016/j.epsl.2017.04.034 |
2017 |
|
xxx |
Oct 16, 2025, 8:23:44 AM |
fhm |
1 |
6698859 |
675376 |
|
|
|
12I9g |
| alder.3081 |
3081 |
|
KFM08A:480 m |
|
Forsmark, Borehole KFM08A (480 m depth) |
Hydrothermal vein or fracture filling |
Fracture with adularia and calcite |
|
|
|
Svecokarelian Orogen |
Bergslagen lithotectonic unit |
|
Stratigraphic position unknown |
Microgeochemistry Laboratory, Department of Earth Sciences, University of Gothenburg |
2 |
Rb-Sr |
Laser ICP-MS |
Multi mineral |
Isochron age |
402.0 |
9.0 |
9.0 |
9.0 |
|
|
|
|
|
6 |
0.47999999 |
|
8 |
Mineralisation age |
Not classified |
Rb/Sr isochrons of co-genetic adularia and calcite yield an age of 402.2 ± 9.4 Ma (2s, MSWD = 0.48, n =6). |
Drake et al 2017 |
Drake, H., Heim, C., Roberts, N.M.W., Zack, T., Tillberg, M., Broman, C., Ivarsson, M., Whitehouse, M.J. & Åström, M.E., 2017: Isotopic evidence for microbial production and consumption of methane in the upper continental crust throughout the Phanerozoic eon. Earth and Planetary Science Letters 470, 108–118. |
http://dx.doi.org/10.1016/j.epsl.2017.04.034 |
2017 |
|
xxx |
Oct 16, 2025, 9:41:00 AM |
fhm |
1 |
6700416 |
675392 |
|
|
|
13I0g |
| alder.3082 |
3082 |
|
KLX01:220 m |
|
Laxemar, Borehole KLX01 (220 m depth) |
Hydrothermal vein or fracture filling |
Fracture with adularia and calcite |
|
|
|
Svecokarelian Orogen |
Småland lithotectonic unit |
|
Stratigraphic position unknown |
Microgeochemistry Laboratory, Department of Earth Sciences, University of Gothenburg |
2 |
Rb-Sr |
Laser ICP-MS |
Multi mineral |
Isochron age |
394.0 |
14.0 |
14.0 |
14.0 |
|
|
|
|
|
5 |
0.23 |
|
8 |
Mineralisation age |
Not classified |
Rb/Sr isochrons of co-genetic adularia and calcite yield an age of 394.± 14 Ma (2s, MSWD = 0.23, n =5). |
Drake et al 2017 |
Drake, H., Heim, C., Roberts, N.M.W., Zack, T., Tillberg, M., Broman, C., Ivarsson, M., Whitehouse, M.J. & Åström, M.E., 2017: Isotopic evidence for microbial production and consumption of methane in the upper continental crust throughout the Phanerozoic eon. Earth and Planetary Science Letters 470, 108–118. |
http://dx.doi.org/10.1016/j.epsl.2017.04.034 |
2017 |
|
xxx |
Oct 16, 2025, 9:41:04 AM |
fhm |
1 |
6366447 |
598247 |
|
|
|
6G3j |
| alder.3083 |
3083 |
|
KFM06C:103 m |
|
Forsmark, Borehole KFM06C (103 m depth) |
Hydrothermal vein or fracture filling |
Fracture with calcite |
|
|
|
Svecokarelian Orogen |
Bergslagen lithotectonic unit |
|
Stratigraphic position unknown |
Geochronology & Tracers Facility, NERC Isotope Geosciences Laboratory, Nottingham, UK |
1 |
U-Pb |
Laser ICP-MS |
Calcite |
Lower intercept age |
173.0 |
8.0 |
8.0 |
8.0 |
|
|
|
|
|
|
1.70000005 |
|
8 |
Mineralisation age |
Not classified |
Calcite sample (minimum d13C value of -47.1‰). Micro-scale U–Pb LA-ICP-MS dating yielded intercepts at 173.2 ± 7.6 Ma and 4260 ± 250 Ma (2s, MSWD = 1.7). |
Drake et al 2017 |
Drake, H., Heim, C., Roberts, N.M.W., Zack, T., Tillberg, M., Broman, C., Ivarsson, M., Whitehouse, M.J. & Åström, M.E., 2017: Isotopic evidence for microbial production and consumption of methane in the upper continental crust throughout the Phanerozoic eon. Earth and Planetary Science Letters 470, 108–118. |
http://dx.doi.org/10.1016/j.epsl.2017.04.034 |
2017 |
|
xxx |
Oct 16, 2025, 9:41:11 AM |
fhm |
1 |
6699629 |
676751 |
|
|
|
12I9g |
| alder.3084 |
3084 |
|
LLKIR22001 |
|
Kiruna airport (coordinates from fig. 1) |
Granitoid |
Highly altered alkali-rich granitoid |
|
|
|
Svecokarelian Orogen |
Norrbotten lithotectonic unit |
|
Intrusive rock GSDG c. 1.88-1.86 Ga |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Weighted average 207Pb/206Pb age |
1875.0 |
5.0 |
5.0 |
5.0 |
|
|
|
|
20 |
15 |
0.97000003 |
|
5 |
Magmatic age |
Not classified |
Zircons are mostly tabular, elongated, angular, prismatic to subrounded, but also highly fractured. The zonation appears concentric. The weighted average 207Pb/206Pb age for concordant analyses is 1875 ± 5 Ma (MSWD = 0.97, n = 15), identical to the concordia age of 1875.9 ± 5.6 Ma (MSWD = 0.89, n = 15). |
Kiyah 2024 |
Kiyah, D.N., 2024: New Age Constraints for the Kiruna Mining District and the Intrusion Near the Rakkurijärvi IOCG Deposit, northern Sweden. Master Thesis: Luleå, Sweden, Luleå University of Technology: 93 p. |
https://www.diva-portal.org/smash/get/diva2:1842652/FULLTEXT01.pdf |
2024 |
|
xxx |
Oct 16, 2025, 10:40:58 AM |
fhm |
1 |
7530402 |
724044 |
|
|
|
29J6i |
| alder.3085 |
3085 |
|
LLRAK21003 |
|
Rakkurijärvi (coordinates from fig. 1) |
Syenitoid |
Hydrothermally altered syenite |
|
|
|
Svecokarelian Orogen |
Norrbotten lithotectonic unit |
|
Intrusive rock GSDG c. 1.88-1.86 Ga |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Weighted average 207Pb/206Pb age |
1881.0 |
6.0 |
6.0 |
6.0 |
|
|
|
|
22 |
10 |
0.23999999 |
|
5 |
Magmatic age |
Not classified |
Zircons are tabular, prismatic, angular in shape and fractured. CL-images reveal oscillatory zoning and xenocrystic cores. The weighted average 207Pb/206Pb age for concordant analyses is 1881 ± 6.1 Ma (MSWD = 0.24, n = 10). The concordia age is 1876.0 ± 3.4 Ma (MSWD = 0.6, n = 10). |
Kiyah 2024 |
Kiyah, D.N., 2024: New Age Constraints for the Kiruna Mining District and the Intrusion Near the Rakkurijärvi IOCG Deposit, northern Sweden. Master Thesis: Luleå, Sweden, Luleå University of Technology: 93 p. |
https://www.diva-portal.org/smash/get/diva2:1842652/FULLTEXT01.pdf |
2024 |
|
xxx |
Oct 16, 2025, 11:24:43 AM |
fhm |
1 |
7525001 |
715651 |
|
|
|
29J4g |
| alder.3086 |
3086 |
|
LLKAA21004 |
|
Kaalasluspa (coordinates from fig. 1) |
Granodiorite |
Granodiorite, altered |
|
|
|
Svecokarelian Orogen |
Norrbotten lithotectonic unit |
|
Intrusive rock GSDG c. 1.88-1.86 Ga |
Nordsim, Swedish Museum of Natural History, Stockholm |
2 |
Rb-Sr |
SIMS |
Zircon |
Weighted average 207Pb/206Pb age |
1877.0 |
8.0 |
8.0 |
8.0 |
|
|
|
|
21 |
17 |
0.61000001 |
|
5 |
Magmatic age |
Not classified |
Zircons are mostly tabular, prismatic, and sub-rounded in shape, with two exceptions: elongation and needle-shaped with fully developed crystal faces. The zircons show concentric and sector zonation.The weighted average 207Pb/206Pb age for concordant analyses is 1876.7 ± 8.1 Ma (MSWD = 0.61, n=17). The concordia age is 1870.8 ± 3.7 Ma (MSWD = 0.66, n=17). |
Kiyah 2024 |
Kiyah, D.N., 2024: New Age Constraints for the Kiruna Mining District and the Intrusion Near the Rakkurijärvi IOCG Deposit, northern Sweden. Master Thesis: Luleå, Sweden, Luleå University of Technology: 93 p. |
https://www.diva-portal.org/smash/get/diva2:1842652/FULLTEXT01.pdf |
2024 |
|
xxx |
Oct 16, 2025, 11:24:47 AM |
fhm |
1 |
7524732 |
712004 |
|
|
|
29J4f |
| alder.3087 |
3087 |
ELH220115A |
|
|
Gammfäbodberget |
Granite |
Granite, leucocratic, medium- to coarse-grained (c. 1–7 mm) granitic rock that is weakly foliated |
|
|
|
Svecokarelian Orogen |
Bothnia-Skellefteå lithotectonic unit |
|
Intrusive rock GP c. 1.87-1.82 Ga |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Concordant age |
1856.0 |
14.0 |
14.0 |
14.0 |
|
|
|
|
20 |
4 |
2.29999995 |
0.031 |
5 |
Magmatic age |
Not classified |
Zircons are subhedral to euhedral, elongated to rounded (50-200 µm long), display core-rim zonation with rounded homogenous core surrounded by a larger euhedral rim, in some grains with a oscillatory zoning (BSE-CL). Some osc. zoned rims are truncated and overgrown by narrow-unzoned rim (metamorphic?). Concordant analyses (n=12) spread between 1.8 Ga to 2.1 Ga, with two age peaks. If the oldest Paleoproterozoic dates (> 1.96 Ga) are excluded and interpreted as inherited, the older cluster yields a wtd. mean 207Pb/206Pb date of 1944 ± 10 Ma (MSWD = 5.8). The younger group has a wtd. mean 207Pb/206Pb age of 1849 ± 10 Ma (MSWD = 2.6) similar to the Concordia date at 1856 ± 14 Ma (2s, MSWD = 2.3, n = 4), which is interpreted as the crystallisation age of the granite. The 1.94 Ga signature is interpreted as inherited source material. Common lead values are not presented. |
Jeanneret et al 2025 |
Jeanneret, P., Sadeghi, M., Persson, S. & Lynch, E., 2025: Insights into Paleoproterozoic magmatic and migmatisation events using U-Pb zircon age dating in Västernorrland, Sweden. Sveriges geologiska undersökning SGU rapport 2025:11, 55 pp. |
https://resource.sgu.se/dokument/publikation/sgurapport/sgurapport202511rapport/s2511-rapport.pdf |
2025 |
|
xxx |
Oct 24, 2025, 7:42:34 AM |
fhm |
1 |
6967527 |
581424 |
|
|
|
18G3i |
| alder.3088 |
3088 |
ELH220082A |
|
|
Norr om Burtjärnen |
Granite |
Granite, medium to coarse-grained (c. 4 mm) texture and is weakly foliated |
|
|
|
Svecokarelian Orogen |
Bothnia-Skellefteå lithotectonic unit |
|
Intrusive rock GDG/GSDG c. 1.96-1.87 Ga (Early Svecokarelian) |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Upper intercept age |
1867.0 |
4.0 |
4.0 |
4.0 |
|
|
|
|
24 |
8 |
1.39999998 |
|
5 |
Magmatic age |
Not classified |
Zircons are subhedral to euhedral, elongated to rounded, 40 to 150 µm long. Rounded cores are in most cases surrounded by a larger homogeneous and dark rim domains (CL) , in some grains with fine oscillatory zoning, and locally truncated and overgrown by another narrow rim. Concordant analyses (n = 14) spread between 1.85 Ga to 2.05 Ga and form two main clusters. The oldest dates obtained from core domains are interpreted as inherited. The data obtained from the dark rim domain plots on a discordia with an upper intercept of 1867 ± 4 Ma and lower intercept forced at 0 ± 10 Ma (2s, MSWD = 1.4, n = 8), with uncertainty interpreted to date the magmatic age of the granite.Common lead values are not presented. |
Jeanneret et al 2025 |
Jeanneret, P., Sadeghi, M., Persson, S. & Lynch, E., 2025: Insights into Paleoproterozoic magmatic and migmatisation events using U-Pb zircon age dating in Västernorrland, Sweden. Sveriges geologiska undersökning SGU rapport 2025:11, 55 pp. |
https://resource.sgu.se/dokument/publikation/sgurapport/sgurapport202511rapport/s2511-rapport.pdf |
2025 |
|
xxx |
Oct 24, 2025, 1:35:37 PM |
fhm |
1 |
6966118 |
591423 |
|
|
|
18H3a |
| alder.3089 |
3089 |
SPN210189A |
|
|
Dalomsberget |
Granite |
Granite, equigranular medium to coarse-grained (c. 3 mm) texture |
|
|
|
Svecokarelian Orogen |
Bothnia-Skellefteå lithotectonic unit |
|
Intrusive rock GDG/GSDG c. 1.96-1.87 Ga (Early Svecokarelian) |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Weighted average 207Pb/206Pb age |
1871.0 |
11.0 |
11.0 |
11.0 |
|
|
|
|
21 |
|
|
|
5 |
Magmatic age |
Not classified |
Zircons are subhedral to euhedral, elongated to rounded, 60-120 µm long. Some grains are metamict with intense fracturing. Most zircons show core-rim zonation with rounded to euhedral cores, osc. zonation in a few grains (BSE-CL). The core-rim domains are often overgrown by a narrow to thick homogenous CL-dark rims (metamorphic ?). The concordant analyses (n = 8) between 1.8 Ga to 2.15 Ga. Several age peaks can be identified (youngest at c. 1.85 Ga) but none of them is dominant and allows to calculate a Concordia date. The younger cluster yields a wtd mean 207Pb/206Pb age of 1871 ± 11 Ma (MSWD = ?, n = ?), interpreted to date igneuous crystallisation of the granite. Older core domains are interpreted to be inherited. The homogenous dark rim domains in CL yield strongly discordant data. Common lead values are not presented. |
Jeanneret et al 2025 |
Jeanneret, P., Sadeghi, M., Persson, S. & Lynch, E., 2025: Insights into Paleoproterozoic magmatic and migmatisation events using U-Pb zircon age dating in Västernorrland, Sweden. Sveriges geologiska undersökning SGU rapport 2025:11, 55 pp. |
https://resource.sgu.se/dokument/publikation/sgurapport/sgurapport202511rapport/s2511-rapport.pdf |
2025 |
|
xxx |
Oct 24, 2025, 1:35:37 PM |
fhm |
1 |
6959956 |
655277 |
|
|
|
18I2c |
| alder.3090 |
3090 |
MSI220047A |
|
|
Nordansjöhöjden |
Granite |
Granite, foliated with a medium-grained (ca. 1 mm) texture and locally with mafic enclaves |
|
|
|
Svecokarelian Orogen |
Bothnia-Skellefteå lithotectonic unit |
|
Intrusive rock GSDG c. 1.88-1.86 Ga |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Upper intercept age |
1862.0 |
3.0 |
3.0 |
3.0 |
|
|
|
|
23 |
10 |
0.36000001 |
|
5 |
Magmatic age |
Not classified |
Zircons are subhedral to euhedral, mainly elongated and 60-200 µm long. Rounded homogenous cores are surrounded by a larger euhedral rims, some with osc. zoning, occasionally truncated and overgrown by another narrow rim (BSE-CL). Some crystals show relatively homogeneous CL and BSE domains without any clear core-rim zonation. There are three older, Mesoarchaean and Paleoproterozoic concordant dates (inherited). The rest of the concordant analyses (n = 10; plots on a discordia line with an upper intercept of 1862 ± 3 Ma with the lower intercept forced at 0 ± 10 (2s, n = 10, MSWD = 0.36). Common lead values are not presented. |
Jeanneret et al 2025 |
Jeanneret, P., Sadeghi, M., Persson, S. & Lynch, E., 2025: Insights into Paleoproterozoic magmatic and migmatisation events using U-Pb zircon age dating in Västernorrland, Sweden. Sveriges geologiska undersökning SGU rapport 2025:11, 55 pp. |
https://resource.sgu.se/dokument/publikation/sgurapport/sgurapport202511rapport/s2511-rapport.pdf |
2025 |
|
xxx |
Oct 24, 2025, 1:35:37 PM |
fhm |
1 |
6973451 |
597659 |
|
|
|
18H4b |
| alder.3091 |
3091 |
MSI230042A |
|
|
Lill-Gälingsberget |
Granite |
Granite, equigranular medium to coarse-grained (c. 3 mm) texture |
|
|
|
Svecokarelian Orogen |
Bothnia-Skellefteå lithotectonic unit |
|
Stratigraphic position unknown |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Upper intercept age |
1848.0 |
6.0 |
6.0 |
6.0 |
|
|
|
|
22 |
3 |
0.95999998 |
|
1 |
Metamorphic age |
Not classified |
Zircons are subhedral to euhedral, mainly rounded, 20-150 µm long. Most grains show a rounded core surrounded in most cases by a larger homogeneous CL-dark rim domain, sometimes truncated and overgrown by another thick and darker rim. Some of the zircon have a CL-bright domain which yields older apparent 207Pb/206Pb ages (c. 1.97 Ga). The concordant analyses spread between 1.85 Ga to 2.05 Ga. The oldest Paleoproterozoic concordant dates obtained from cores are interpreted as inherited. The dark rim domain yield an upper intercept of 1848 ± 6 Ma including two weakly discordant rim analyses and a forced lower intercept at 0 ± 10 Ma (2s, n = 3, MSWD = 0.96). This date was interpreted as the age of metamorphism/deformation, but according to authors more data would be needed to confirm this interpretation and identify the magmatic age of this granitic rock. Common lead values are not presented. |
Jeanneret et al 2025 |
Jeanneret, P., Sadeghi, M., Persson, S. & Lynch, E., 2025: Insights into Paleoproterozoic magmatic and migmatisation events using U-Pb zircon age dating in Västernorrland, Sweden. Sveriges geologiska undersökning SGU rapport 2025:11, 55 pp. |
https://resource.sgu.se/dokument/publikation/sgurapport/sgurapport202511rapport/s2511-rapport.pdf |
2025 |
|
xxx |
Oct 24, 2025, 1:35:37 PM |
fhm |
1 |
6982194 |
655190 |
|
|
|
18I6j |
| alder.3092 |
3092 |
ELH230145B |
|
|
Sör-Nysjön |
Granite |
Micro-granite, weakly foliated occurring as a 0.6 m wide, subvertical dyke that crosscuts both migmatitic metasedimentary rocks and a foliated biotite granitoid. The rock has an equigranular, fine to medium-grained (ca. 1 mm) granitic texture |
|
|
|
Svecokarelian Orogen |
Bothnia-Skellefteå lithotectonic unit |
|
Stratigraphic position unknown |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
207Pb/206Pb age |
|
|
|
|
1670.0 |
2700.0 |
|
|
20 |
|
|
|
0 |
not known |
Not classified |
Zircon grains are subhedral to euhedral, elongated to rounded, 50-150 µm long. Most grains show subtle core-rim zonation with rounded to euhedral cores (BSE-CL). Some of the grains display a metamict texture with intense fracturing. A few grains show oscillatory zoning in CL-bright domains, overgrown by narrow to thick homogenous CL-dark rims. Analyses spread in age between 1.5 Ga and 2.7 Ga, however only 3 spots are younger than 1.9 Ga. Two age peaks can be identified, the older cluster yields a wtd mean 207Pb/206Pb date of 2693 ± 49 Ma (n = 3; MSWD = 11), and the younger one a wtd mean 207Pb/206Pb date of 1996 ± 41 Ma (n = 9; MSWD = 79). Two concordant analyses from a single zircon yield a concordia date at 1674 ± 11 Ma (2s, n=2, MSWD = 0.059, prob. 0.81). Common lead values are not presented. |
Jeanneret et al 2025 |
Jeanneret, P., Sadeghi, M., Persson, S. & Lynch, E., 2025: Insights into Paleoproterozoic magmatic and migmatisation events using U-Pb zircon age dating in Västernorrland, Sweden. Sveriges geologiska undersökning SGU rapport 2025:11, 55 pp. |
https://resource.sgu.se/dokument/publikation/sgurapport/sgurapport202511rapport/s2511-rapport.pdf |
2025 |
|
xxx |
Oct 24, 2025, 1:35:37 PM |
fhm |
1 |
6973669 |
589120 |
|
|
|
18G4j |
| alder.3093 |
3093 |
SPN230513A |
|
|
Gammfädbodberget |
Granodiorite |
Granodiorite, weakly foliated granodioritic rock with a medium to coarse-grained (c. 3 mm) texture |
|
|
|
Svecokarelian Orogen |
Bothnia-Skellefteå lithotectonic unit |
|
Intrusive rock GDG/GSDG c. 1.96-1.87 Ga (Early Svecokarelian) |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Upper intercept age |
1883.0 |
5.0 |
5.0 |
5.0 |
|
|
|
|
22 |
5 |
0.74000001 |
|
5 |
Magmatic age |
Not classified |
Zircons are mostly euhedral and elongated, 90-300 µm long and show core-rim internal texture (BSE-CL). Most of the grains display a well-defined oscillatory magmatic zoning in the core and rim domains. The concordant (n = 10) analyses spread between 1.85 Ga and 2.9 Ga, with two identified age peaks at c. 2.86 Ga (n = 1) and a younger one plots on a discordia line with an upper intercept of 1883 ± 5 Ma and with forced lower intercept at 0 ± 10 Ma ((n = 5, 2s, MSWD = 0.74). Common lead values are not presented. |
Jeanneret et al 2025 |
Jeanneret, P., Sadeghi, M., Persson, S. & Lynch, E., 2025: Insights into Paleoproterozoic magmatic and migmatisation events using U-Pb zircon age dating in Västernorrland, Sweden. Sveriges geologiska undersökning SGU rapport 2025:11, 55 pp. |
https://resource.sgu.se/dokument/publikation/sgurapport/sgurapport202511rapport/s2511-rapport.pdf |
2025 |
|
xxx |
Oct 24, 2025, 1:35:37 PM |
fhm |
1 |
6965118 |
640632 |
|
|
|
18H3j |
| alder.3094 |
3094 |
ELH230187A |
|
|
Hölleforsen |
Granodiorite |
Granodiorite, foliated, feldspar-phyric granodioritic to granitic rock with a medium to coarse-grained (c. 1–10 mm) equigranular to porphyritic texture. Locally, the granitoid contains biotite-rich lenticular seams and enclaves. |
|
|
|
Svecokarelian Orogen |
Bothnia-Skellefteå lithotectonic unit |
|
Intrusive rock GDG/GSDG c. 1.96-1.87 Ga (Early Svecokarelian) |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Concordant age |
1869.0 |
3.0 |
3.0 |
3.0 |
|
|
|
|
23 |
11 |
1.39999998 |
0.089 |
5 |
Magmatic age |
Not classified |
Zircons are mostly euhedral, rounded to elongated, and 70-250 µm long. Most grains show core-rim internal texture with brighter CL euhedral core surrounded by larger euhedral rim which presents a oscillatory zoning. Rarely, the rim is truncated and overgrown by another narrow rim. There are two older concordant dates which are interpreted as inherited. The rest of the concordant analyses is distributed between core (n = 9) and rim domains (n = 2) give a concordia age at 1869 ± 3 Ma (2s, MSWD = 1.4, n = 11), interpreted to date igneous crystallisation of the granodiorite. Common lead values are not presented. |
Jeanneret et al 2025 |
Jeanneret, P., Sadeghi, M., Persson, S. & Lynch, E., 2025: Insights into Paleoproterozoic magmatic and migmatisation events using U-Pb zircon age dating in Västernorrland, Sweden. Sveriges geologiska undersökning SGU rapport 2025:11, 55 pp. |
https://resource.sgu.se/dokument/publikation/sgurapport/sgurapport202511rapport/s2511-rapport.pdf |
2025 |
|
xxx |
Oct 24, 2025, 1:35:37 PM |
fhm |
1 |
6981090 |
584914 |
|
|
|
18G6i |
| alder.3095 |
3095 |
MSI230176A |
|
|
Edsbacken |
Granodiorite |
Granodiorite to tonalite, medium-grained (c. 1 mm) texture |
|
|
|
Svecokarelian Orogen |
Bothnia-Skellefteå lithotectonic unit |
|
Intrusive rock GDG/GSDG c. 1.96-1.87 Ga (Early Svecokarelian) |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Concordant age |
1866.0 |
7.0 |
7.0 |
7.0 |
|
|
|
|
20 |
13 |
1.60000002 |
0.024 |
5 |
Magmatic age |
Not classified |
Zircons are mostly euhedral, elongated, and 80-300 µm long. Core and rim domains show a well-defined oscillatory magmatic zoning. Rarely, the rim is truncated and overgrown by another narrow and homogeneous rim (BSE-CL). Concordant analyses located either in the core or in the rim of the zircon grain give concordia age of 1866 ± 7 Ma (2s, MSWD = 1.6, n = 11), interpreted to date igneous crystallisation of the granodiorite. Common lead values are not presented. |
Jeanneret et al 2025 |
Jeanneret, P., Sadeghi, M., Persson, S. & Lynch, E., 2025: Insights into Paleoproterozoic magmatic and migmatisation events using U-Pb zircon age dating in Västernorrland, Sweden. Sveriges geologiska undersökning SGU rapport 2025:11, 55 pp. |
https://resource.sgu.se/dokument/publikation/sgurapport/sgurapport202511rapport/s2511-rapport.pdf |
2025 |
|
xxx |
Oct 24, 2025, 1:35:37 PM |
fhm |
1 |
6982801 |
648247 |
|
|
|
18I6b |
| alder.3096 |
3096 |
SPN230377A |
|
|
Kroketjärnen |
Migmatite |
Schollen diatexite migmatite consisting of scattered, smaller blocks of lens-shape melanosome in a groundmass of heterogeneous, leucocratic neosome |
|
|
|
Svecokarelian Orogen |
Bothnia-Skellefteå lithotectonic unit |
|
Supracrustal rock c. 1.96-1.86 Ga (Svecofennian) |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Concordant age |
1862.0 |
6.0 |
6.0 |
6.0 |
|
|
|
|
20 |
6 |
0.68000001 |
0.75999999 |
1 |
Metamorphic age |
Not classified |
Zircons are subhedral to euhedral, elongated to rounded and show core-rim internal texture. Cores are rounded to embayed and surrounded by a larger rim which is also rounded in most cases and can display oscillatory zoning. The rim and sometimes even the core are truncated and overgrown by a thick and homogeneous darker rim which is most probably of metamorphic origin. The concordant analyses are spread between 1.85 Ga and 3.0 Ga, where the older Individual apparent 207Pb/206Pb ages are widely spread and are interpreted as inherited dates. One predominant age peak can be identified at c. 1.98 Ga (n = 9). Six analyses have been performed on the overgrowth of zircon grains yield a concordant date of 1862 ± 6 Ma (2s, MSWD = 0.68), interpreted to date migmatisation. Common lead values are not presented. |
Jeanneret et al 2025 |
Jeanneret, P., Sadeghi, M., Persson, S. & Lynch, E., 2025: Insights into Paleoproterozoic magmatic and migmatisation events using U-Pb zircon age dating in Västernorrland, Sweden. Sveriges geologiska undersökning SGU rapport 2025:11, 55 pp. |
https://resource.sgu.se/dokument/publikation/sgurapport/sgurapport202511rapport/s2511-rapport.pdf |
2025 |
|
xxx |
Oct 24, 2025, 1:35:37 PM |
fhm |
1 |
6957769 |
573469 |
|
|
|
18G1g |
| alder.3097 |
3097 |
MSI230137A |
|
|
Skorrmyrhöjden |
Granite |
Leucosome of diatexite migmatite with preserved paleosome of metagreywacke composition |
|
|
|
Svecokarelian Orogen |
Bothnia-Skellefteå lithotectonic unit |
|
Supracrustal rock c. 1.96-1.86 Ga (Svecofennian) |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Concordant age |
1868.0 |
7.0 |
7.0 |
7.0 |
|
|
|
|
28 |
2 |
0.85000002 |
0.46000001 |
1 |
Metamorphic age |
Not classified |
Zircons are subhedral to euhedral, elongated to rounded, 50 to 250 µm long. CL and BSE images reveal a core-rim zonation. The rim and sometimes even the core are truncated and overgrown by a thick and homogeneous darker rim most probably of metamorphic origin. The concordant analyses (n=20) spread between 1.86 Ga and 2.7 Ga with two age peaks. The older cluster yields a weighted mean 207Pb/206Pb date of 2712 ± 37 Ma (n = 4), and the younger one a weighted mean 207Pb/206Pb date of 1957 ± 30 Ma (n = 14), are interpreted as inherited dates. Two analyses on the zircon overgrowths yield a concordant date of 1868 ± 7 Ma (2s, MSWD = 0.85), interpreted as a metamorphic age. Common lead values are not presented. |
Jeanneret et al 2025 |
Jeanneret, P., Sadeghi, M., Persson, S. & Lynch, E., 2025: Insights into Paleoproterozoic magmatic and migmatisation events using U-Pb zircon age dating in Västernorrland, Sweden. Sveriges geologiska undersökning SGU rapport 2025:11, 55 pp. |
https://resource.sgu.se/dokument/publikation/sgurapport/sgurapport202511rapport/s2511-rapport.pdf |
2025 |
|
xxx |
Oct 27, 2025, 8:04:15 AM |
fhm |
1 |
6980433 |
616549 |
|
|
|
18H6f |
| alder.3098 |
3098 |
SPN221204A |
|
|
Gråssjön |
Rhyolite |
Metarhyolite?, leucocratic rock with a fine to medium grained texture and a well-developed tectonic foliation |
|
|
|
Svecokarelian Orogen |
Bothnia-Skellefteå lithotectonic unit |
|
Supracrustal rock c. 1.96-1.86 Ga (Svecofennian) |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Concordant age |
1873.0 |
2.0 |
2.0 |
2.0 |
|
|
|
|
19 |
12 |
1.29999995 |
0.13 |
5 |
Magmatic age |
Not classified |
Zircons are subhedral to euhedral, elongated to rounded, and 60 to 200 µm long. Cores are rounded to elongated and surrounded by a larger euhedral rim, with oscillatory magmatic zoning seen in a few grains (CL). The oldest concordant date is Mesoarchaean (c. 2.8 Ga) and interpreted as inherited. The twelve concordant analyses from the core yield a concordia date of 1873 ± 2 Ma (2s, MSWD of concordance and equivalence = 1.3), interpreted as the igneous crystallisation age of the rhyolite. The remaining concordant analysis comes from the rim of zircon yields an apparent 207Pb/206Pb age of 1878 ± 5 Ma. Common lead values are not presented. |
Jeanneret et al 2025 |
Jeanneret, P., Sadeghi, M., Persson, S. & Lynch, E., 2025: Insights into Paleoproterozoic magmatic and migmatisation events using U-Pb zircon age dating in Västernorrland, Sweden. Sveriges geologiska undersökning SGU rapport 2025:11, 55 pp. |
https://resource.sgu.se/dokument/publikation/sgurapport/sgurapport202511rapport/s2511-rapport.pdf |
2025 |
|
xxx |
Oct 27, 2025, 8:04:15 AM |
fhm |
1 |
6958718 |
539176 |
|
|
|
18F2j |
| alder.3099 |
3099 |
MSI230033C |
|
|
Dala Gårdbergsmyran |
Dacite |
Metarhyolite-dacite, leucocratic extrusive igneous rock with a quartz-K-feldspar porphyritic texture |
|
|
|
Svecokarelian Orogen |
Bothnia-Skellefteå lithotectonic unit |
|
Supracrustal rock c. 2.4-1.96 Ga (Karelian) |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Upper intercept age |
1978.0 |
8.0 |
8.0 |
8.0 |
|
|
|
|
28 |
13 |
3.29999995 |
|
5 |
Magmatic age |
Not classified |
Zircons are subhedral to euhedral, elongated to rounded, and 50 to 200 µm long. CL and BSE images reveal a core-rim zonation, truncated and overgrown by another thick rim. Individual apparent 207Pb/206Pb ages display two age peaks. One older cluster (n = 3) at c. 2.7 Ga is interpreted as inherited and the younger one which is predominant (n = 13) plots on a discordia with an upper intercept of 1978 ± 8 Ma (2s, MSWD = 3.3) and a forced lower intercept at 0 ± 10 Ma, interpreted as the igneous crystallisation age of the rock. Common lead values are not presented. |
Jeanneret et al 2025 |
Jeanneret, P., Sadeghi, M., Persson, S. & Lynch, E., 2025: Insights into Paleoproterozoic magmatic and migmatisation events using U-Pb zircon age dating in Västernorrland, Sweden. Sveriges geologiska undersökning SGU rapport 2025:11, 55 pp. |
https://resource.sgu.se/dokument/publikation/sgurapport/sgurapport202511rapport/s2511-rapport.pdf |
2025 |
|
xxx |
Oct 27, 2025, 8:04:15 AM |
fhm |
1 |
6982647 |
657719 |
|
|
|
18I6d |
| alder.3100 |
3100 |
ELH210128A |
|
|
Sörholmen |
Dacite |
Metadacite, leucocratic extrusive or subvolcanic igneous rock with a porphyritic texture. It is in contact with a foliated meta-granite and crosscut by a narrow, irregular aplite-pegmatite dyke |
|
|
|
Svecokarelian Orogen |
Bothnia-Skellefteå lithotectonic unit |
|
Supracrustal rock c. 1.96-1.86 Ga (Svecofennian) |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Upper intercept age |
1869.0 |
8.0 |
8.0 |
8.0 |
|
|
|
|
19 |
3 |
0.31 |
|
5 |
Magmatic age |
Not classified |
Zircons are euhedral, mainly elongated, 70 to 200 µm long and show oscillatory zoning (CL-BSE). The oldest concordant date (c. 1.97 Ga) is interpreted as inherited. The remaining concordant analyses plot roughly on a discordia line with an upper intercept of 1869 ± 8 Ma with a forced lower intercept at 0 ± 10 Ma (2s, MSWD = 0.31, n = 3), interpreted as the igneous crystallisation age of the rock. Common lead values are not presented. |
Jeanneret et al 2025 |
Jeanneret, P., Sadeghi, M., Persson, S. & Lynch, E., 2025: Insights into Paleoproterozoic magmatic and migmatisation events using U-Pb zircon age dating in Västernorrland, Sweden. Sveriges geologiska undersökning SGU rapport 2025:11, 55 pp. |
https://resource.sgu.se/dokument/publikation/sgurapport/sgurapport202511rapport/s2511-rapport.pdf |
2025 |
|
xxx |
Oct 27, 2025, 8:04:15 AM |
fhm |
1 |
6968580 |
655667 |
|
|
|
18I3c |
| alder.3101 |
3101 |
ELH210117B |
|
|
Halsviken |
Amphibolite |
Amphibolite, foliated, fine to medium grained (c. 0.2–2 mm), dark green-black, occurring as a dyke about 30 cm in width. The dyke vertically crosscuts a foliated metagreywacke. |
|
|
|
Svecokarelian Orogen |
Bothnia-Skellefteå lithotectonic unit |
|
Stratigraphic position unknown |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Concordant age |
1854.0 |
5.0 |
5.0 |
5.0 |
|
|
|
|
8 |
2 |
2.0 |
0.11 |
5 |
Magmatic age |
Not classified |
Only three zircon grains were analysed, and they all show different features and zoning patterns. A common characteristic is that the core/rim domain is overgrown by a narrow homogenous CL-dark rim domains that might correspond to a metamorphic or a fluid-mediated alteration phase. The only two concordant analyses come from the homogeneous core domain of zircon 3 and yield a Concordia date of 1854 ± 5 Ma (MSWD of concordance and equivalence = 2, probability = 0.11), interpreted to date the magmatic age of the rock. Common lead values are not presented. |
Jeanneret et al 2025 |
Jeanneret, P., Sadeghi, M., Persson, S. & Lynch, E., 2025: Insights into Paleoproterozoic magmatic and migmatisation events using U-Pb zircon age dating in Västernorrland, Sweden. Sveriges geologiska undersökning SGU rapport 2025:11, 55 pp. |
https://resource.sgu.se/dokument/publikation/sgurapport/sgurapport202511rapport/s2511-rapport.pdf |
2025 |
|
xxx |
Oct 27, 2025, 8:04:15 AM |
fhm |
1 |
6965709 |
660931 |
|
|
|
18I3d |
| alder.3102 |
3102 |
|
JBHA19005 |
|
Kalixforsbron |
Granite |
Aplitic granite |
|
Perthite monzonite suite |
|
Svecokarelian Orogen |
Norrbotten lithotectonic unit |
|
Intrusive rock GSDG c. 1.88-1.86 Ga |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Upper intercept age |
1875.0 |
|
|
|
|
|
471.0 |
|
34 |
26 |
5.19999981 |
|
5 |
Magmatic age |
Not classified |
The zircons are pink weakly prismatic or subhedral, and show oscillatory to irregular zonation patterns and occasional resorption embayments. Many grains are highly fractured. most of the dataset yielding > 5% discordance. A lightly trimmed dataset removing the highly discordant points with correlating textural evidence (e.g., cracks) produces a weak discordia trend (MSWD = 5.2, n = 26) between c. 1875 and c. 470 Ma, suggested an early orogenic igneous crystallisation age of the rock, |
Logan et al 2022 |
Logan, L., Andersson, J.B.H., Whitehouse, M.J., Martinsson, O. & Bauer, T.E., 2022: Energy Drive for the Kiruna Mining District Mineral System(s): Insights from U-Pb Zircon Geochronology. Minerals 12, 1-25. |
https://doi.org/10.3390/min12070875 |
2022 |
|
xxx |
Oct 27, 2025, 8:14:28 AM |
fhm |
1 |
7523019 |
719786 |
|
|
|
29J4h |
| alder.3103 |
3103 |
|
JBHA19008 |
|
Kalixforsbron |
Gabbro |
Magnetite–ilmenite gabbro |
|
Perthite monzonite suite |
|
Svecokarelian Orogen |
Norrbotten lithotectonic unit |
|
Intrusive rock GSDG c. 1.88-1.86 Ga |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Weighted average 207Pb/206Pb age |
1877.0 |
10.0 |
10.0 |
10.0 |
|
|
|
|
12 |
9 |
1.29999995 |
|
5 |
Magmatic age |
Not classified |
Seven zircon grains were collected from 5 kg of sample. These were transparent and subhedral to rounded, oscillatory zoned, and with CL-bright rims. Excluding three data point due to discordance (n = 2) and large error (n = 1), the remaining concordant data yield a weighted average 207Pb/206Pb age of 1877 ± 10 Ma (95% conf., MSWD = 1.3, n = 9) |
Logan et al 2022 |
Logan, L., Andersson, J.B.H., Whitehouse, M.J., Martinsson, O. & Bauer, T.E., 2022: Energy Drive for the Kiruna Mining District Mineral System(s): Insights from U-Pb Zircon Geochronology. Minerals 12, 1-25. |
https://doi.org/10.3390/min12070875 |
2022 |
|
xxx |
Oct 27, 2025, 5:00:18 PM |
fhm |
1 |
7522725 |
720539 |
|
|
|
29J4h |
| alder.3104 |
3104 |
|
JBHA19017 |
|
Saarijärvi |
Granite |
Granite, magnetite-bearing, medium-fine-grained granitic rock rich in potassium feldspar, with patchy areas of coarse quartz–potassium feldspar |
|
Perthite monzonite suite |
|
Svecokarelian Orogen |
Norrbotten lithotectonic unit |
|
Intrusive rock GSDG c. 1.88-1.86 Ga |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Weighted average 207Pb/206Pb age |
1887.0 |
4.0 |
4.0 |
4.0 |
|
|
|
|
32 |
7 |
0.25 |
|
5 |
Magmatic age |
Not classified |
Zircons are pink and have narrow prismatic, broad prismatic, and stubby shapes. Internal textures are generally homogenous with limited irregular to concentric internal zonation. The zircon grains have a moderate crack density and are often broken. Seven concordant analyses yield a weighted average 207Pb/206Pb age of 1887 ± 4 Ma (95% conf., MSWD = 0.25, n = 7), which is proposed to best represent the crystallization age of the rock. One analysis plots younger than the concordant cluster with a 207Pb/206Pb age of 1848 ± 24 Ma (2s) and is interpreted to possibly represent a late metamorphic zircon growth. |
Logan et al 2022 |
Logan, L., Andersson, J.B.H., Whitehouse, M.J., Martinsson, O. & Bauer, T.E., 2022: Energy Drive for the Kiruna Mining District Mineral System(s): Insights from U-Pb Zircon Geochronology. Minerals 12, 1-25. |
https://doi.org/10.3390/min12070875 |
2022 |
|
xxx |
Oct 27, 2025, 5:00:18 PM |
fhm |
1 |
7527323 |
711237 |
|
|
|
29J5f |
| alder.3105 |
3105 |
|
JBHA19025 |
|
Saarijärvi |
Quartz syenite |
Quartz syenite, a pink, potassic-altered, medium-coarse-grained |
|
Perthite monzonite suite |
|
Svecokarelian Orogen |
Norrbotten lithotectonic unit |
|
Intrusive rock GSDG c. 1.88-1.86 Ga |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Weighted average 207Pb/206Pb age |
1880.0 |
7.0 |
7.0 |
7.0 |
|
|
|
|
26 |
12 |
0.89999998 |
|
5 |
Magmatic age |
Not classified |
The zircons are prismatic with the majority showing complex zoning patterns and few showing oscillatory zoning. Resorbed textures indicate multiple generations of zircon stability. Fracture density is moderate, and it is common to see radial fractures around CL-dark cores, suggesting high-U cores and differential volume expansion during metamictization. Twelve concordant analyses from the sample yield a weighted average 207Pb/206Pb of 1880 ± 7 Ma (95% conf., MSWD = 0.9, n = 12) and is interpreted as igneous crystallization age for the rock. Three concordant analyses plot significantly away from the concordant cluster and were excluded from the age calculation. |
Logan et al 2022 |
Logan, L., Andersson, J.B.H., Whitehouse, M.J., Martinsson, O. & Bauer, T.E., 2022: Energy Drive for the Kiruna Mining District Mineral System(s): Insights from U-Pb Zircon Geochronology. Minerals 12, 1-25. |
https://doi.org/10.3390/min12070875 |
2022 |
|
xxx |
Oct 27, 2025, 5:00:18 PM |
fhm |
1 |
7527359 |
709173 |
|
|
|
29J5f |
| alder.3106 |
3106 |
|
LLPAH19065 |
|
Saarijärvi (Dh PAH92002, 19 m) |
Granite |
Granite, fine-grained, light pink, porphyritic texture |
|
Perthite monzonite suite |
|
Svecokarelian Orogen |
Norrbotten lithotectonic unit |
|
Intrusive rock GSDG c. 1.88-1.86 Ga |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Weighted average 207Pb/206Pb age |
1880.0 |
3.0 |
3.0 |
3.0 |
|
|
|
|
38 |
14 |
0.89999998 |
|
5 |
Magmatic age |
Not classified |
The zircons are regular- to subhedral prismatic with a moderate fracture frequency. The grains show weak oscillatory zoning, sector zoning, and typically have a thin dark and partially digested rim of <10 µm. Of the data overlapping the concordia curve, two analyses were removed from the age calculation because the 2s error ellipse did not correlate statistically with the concordant cluster and have slightly younger 207Pb/206Pb ages. The resulting weighted average 207Pb/206Pb age is 1880 ± 3 Ma (95% conf., MSWD = 0.9, n = 14, and is taken as the igneous crystallization age of the sample |
Logan et al 2022 |
Logan, L., Andersson, J.B.H., Whitehouse, M.J., Martinsson, O. & Bauer, T.E., 2022: Energy Drive for the Kiruna Mining District Mineral System(s): Insights from U-Pb Zircon Geochronology. Minerals 12, 1-25. |
https://doi.org/10.3390/min12070875 |
2022 |
|
xxx |
Oct 27, 2025, 5:00:18 PM |
fhm |
1 |
7528947 |
711824 |
|
|
|
29J5f |
| alder.3107 |
3107 |
|
LLSAR19097 |
|
Saarijärvi |
Granite |
Granite, medium-grained quartz-rich |
|
|
|
Svecokarelian Orogen |
Norrbotten lithotectonic unit |
|
Archean >2.5 Ga |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Weighted average 207Pb/206Pb age |
2698.0 |
3.0 |
3.0 |
3.0 |
|
|
|
|
24 |
7 |
0.80000001 |
|
5 |
Magmatic age |
Not classified |
Zircons have gray and pink coloration, prismatic shapes, and moderate crack density. The grains are homogenous to oscillatory zoned, with some grains showing thin (1–5 µm) overgrowth rims that tend to be inclusion-rich. A concordant cluster yields a weighted average 207Pb/206Pb age of 2698 ± 3 Ma (95% conf., MSWD = 0.8, n = 7), which is taken as the best estimate for the age of igneous crystallization. |
Logan et al 2022 |
Logan, L., Andersson, J.B.H., Whitehouse, M.J., Martinsson, O. & Bauer, T.E., 2022: Energy Drive for the Kiruna Mining District Mineral System(s): Insights from U-Pb Zircon Geochronology. Minerals 12, 1-25. |
https://doi.org/10.3390/min12070875 |
2022 |
|
xxx |
Oct 27, 2025, 5:00:18 PM |
fhm |
1 |
7526604 |
709743 |
|
|
|
29J5f |
| alder.3108 |
3108 |
|
LLPAH19098 |
|
Pahtohavare |
Andesitoid |
Porphyritic quartz andesite, with cm-scale plagioclase laths encompassed by a fine-grained biotite-rich matrix |
|
Porphyrite group? |
|
Svecokarelian Orogen |
Norrbotten lithotectonic unit |
|
Supracrustal rock c. 1.96-1.86 Ga (Svecofennian) |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Weighted average 207Pb/206Pb age |
1911.0 |
12.0 |
12.0 |
12.0 |
|
|
|
|
16 |
4 |
1.89999998 |
|
5 |
Magmatic age |
Not classified |
Zircons are transparent and prismatic with oscillatory zones. Some grains occasionally record an inner zone of inclusions. Weak radial fracture patterns are occasionally observed around cores. Only a few data points (n = 4) are concordant, which yield a weighted average 207Pb/206Pb age of 1911 ± 12 Ma (95% conf., MSWD = 1.9), which is interpreted to best represent the magmatic age of the rock. Two zircon grains are inherited with apparently different 207Pb/206Pb ages (one discordant at 2689 ± 5 Ma and one concordant at 2210 ± 7 Ma). A regression line through the data, excluding the inherited points and other spots with textural defects, results in a weak discordia trend between ~1910 and ~418 Ma |
Logan et al 2022 |
Logan, L., Andersson, J.B.H., Whitehouse, M.J., Martinsson, O. & Bauer, T.E., 2022: Energy Drive for the Kiruna Mining District Mineral System(s): Insights from U-Pb Zircon Geochronology. Minerals 12, 1-25. |
https://doi.org/10.3390/min12070875 |
2022 |
|
xxx |
Oct 27, 2025, 5:00:18 PM |
fhm |
1 |
7527381 |
713693 |
|
|
|
29J5f |
| alder.3109 |
3109 |
WSR140015E |
|
|
Karhakkamaa |
Basaltoid |
Hornblende-amphibolite, medium- to fine-grained |
|
Porphyrite group |
Pajala Shear Zone, Western Shear Zone |
Svecokarelian Orogen |
Överkalix lithotectonic unit |
|
Supracrustal rock c. 1.96-1.86 Ga (Svecofennian) |
AGES (Automated Gas Extraction System) facility at Vrije Universiteit, Amsterdam |
6 |
Ar-Ar |
Step-wise heating |
Hornblende |
Plateau age |
1704.0 |
17.0 |
17.0 |
17.0 |
|
|
|
|
|
|
|
|
4 |
Cooling age |
Not classified |
The hornblende incremental heating experiment yielded a plateau age of 1704 ± 17 Ma (2s) |
Djuly 2018 |
Djuly, T., 2018: The Thermal and Tectonic history of the Palaeoproterozoic Pajala Shear Zone constrained by 40Ar/39Ar thermochronology. Thesis for MSc, Earth Sciences, Vrije Universiteit, Amsterdam, 259 pp. |
https://doi.org/10.13140/RG.2.2.25250.03522 |
2018 |
|
xxx |
Oct 28, 2025, 4:37:34 PM |
fhm |
1 |
7453552 |
845989 |
|
|
|
28M0c |
| alder.3110 |
3110 |
WSR140021C |
|
|
Ruuttilaki |
Paragneiss |
Metapelitic biotite gneiss, locally migmatized |
|
|
Pajala Shear Zone, Western Shear Zone |
Svecokarelian Orogen |
Överkalix lithotectonic unit |
|
Supracrustal rock c. 1.96-1.86 Ga (Svecofennian) |
AGES (Automated Gas Extraction System) facility at Vrije Universiteit, Amsterdam |
6 |
Ar-Ar |
Step-wise heating |
K-feldspar |
Plateau age |
1193.0 |
9.0 |
9.0 |
9.0 |
|
|
|
|
|
|
|
|
4 |
Cooling age |
Not classified |
After the initial step the alkali feldspar displays a distinct staircase pattern with a lower age of 1193±9 Ma (2s) and an upper age of 1468 ± 25 Ma (2s). |
Djuly 2018 |
Djuly, T., 2018: The Thermal and Tectonic history of the Palaeoproterozoic Pajala Shear Zone constrained by 40Ar/39Ar thermochronology. Thesis for MSc, Earth Sciences, Vrije Universiteit, Amsterdam, 259 pp. |
https://doi.org/10.13140/RG.2.2.25250.03522 |
2018 |
|
xxx |
Oct 28, 2025, 4:37:34 PM |
fhm |
1 |
7470276 |
869637 |
|
|
|
28M3h |
| alder.3111 |
3111 |
WSR140021C |
|
|
Ruuttilaki |
Paragneiss |
Metapelitic biotite gneiss, locally migmatized |
|
|
Pajala Shear Zone, Western Shear Zone |
Svecokarelian Orogen |
Överkalix lithotectonic unit |
|
Supracrustal rock c. 1.96-1.86 Ga (Svecofennian) |
AGES (Automated Gas Extraction System) facility at Vrije Universiteit, Amsterdam |
6 |
Ar-Ar |
Step-wise heating |
K-feldspar |
Plateau age |
1468.0 |
25.0 |
25.0 |
25.0 |
|
|
|
|
|
|
|
|
4 |
Cooling age |
Not classified |
After the initial step the alkali feldspar displays a distinct staircase pattern with a lower age of 1193±9 Ma (2s) and an upper age of 1468 ± 25 Ma (2s). |
Djuly 2018 |
Djuly, T., 2018: The Thermal and Tectonic history of the Palaeoproterozoic Pajala Shear Zone constrained by 40Ar/39Ar thermochronology. Thesis for MSc, Earth Sciences, Vrije Universiteit, Amsterdam, 259 pp. |
https://doi.org/10.13140/RG.2.2.25250.03522 |
2018 |
|
xxx |
Oct 28, 2025, 4:37:34 PM |
fhm |
1 |
7470276 |
869637 |
|
|
|
28M3h |
| alder.3112 |
3112 |
WSR140021C |
|
|
Ruuttilaki |
Paragneiss |
Metapelitic biotite gneiss, locally migmatized |
|
|
Pajala Shear Zone, Western Shear Zone |
Svecokarelian Orogen |
Överkalix lithotectonic unit |
|
Supracrustal rock c. 1.96-1.86 Ga (Svecofennian) |
AGES (Automated Gas Extraction System) facility at Vrije Universiteit, Amsterdam |
6 |
Ar-Ar |
Step-wise heating |
Biotite |
Plateau age |
1536.0 |
14.0 |
14.0 |
14.0 |
|
|
|
|
|
|
|
|
4 |
Cooling age |
Not classified |
The biotite incremental heating experiment displays a relatively reliable plateau age of 1536 ± 14 Ma (2s) |
Djuly 2018 |
Djuly, T., 2018: The Thermal and Tectonic history of the Palaeoproterozoic Pajala Shear Zone constrained by 40Ar/39Ar thermochronology. Thesis for MSc, Earth Sciences, Vrije Universiteit, Amsterdam, 259 pp. |
https://doi.org/10.13140/RG.2.2.25250.03522 |
2018 |
|
xxx |
Oct 28, 2025, 4:37:34 PM |
fhm |
1 |
7470276 |
869637 |
|
|
|
28M3h |
| alder.3113 |
3113 |
WSR140024D |
|
|
Triikivaara |
Granodiorite |
Metagranodioritoid |
|
Haparanda suite |
Pajala Shear Zone, West |
Svecokarelian Orogen |
Norrbotten lithotectonic unit |
|
Intrusive rock GDG/GSDG c. 1.96-1.87 Ga (Early Svecokarelian) |
AGES (Automated Gas Extraction System) facility at Vrije Universiteit, Amsterdam |
6 |
Ar-Ar |
Step-wise heating |
K-feldspar |
Plateau age |
1219.0 |
9.0 |
9.0 |
9.0 |
|
|
|
|
|
|
|
|
4 |
Cooling age |
Not classified |
Alkali feldspar displays a distinct staircase pattern with a lower age of 1219 ± 9 Ma (2s) and an upper age of 1440 ± 13 Ma (2s) |
Djuly 2018 |
Djuly, T., 2018: The Thermal and Tectonic history of the Palaeoproterozoic Pajala Shear Zone constrained by 40Ar/39Ar thermochronology. Thesis for MSc, Earth Sciences, Vrije Universiteit, Amsterdam, 259 pp. |
https://doi.org/10.13140/RG.2.2.25250.03522 |
2018 |
|
xxx |
Oct 28, 2025, 4:37:34 PM |
fhm |
1 |
7467444 |
836410 |
|
|
|
28M3a |
| alder.3114 |
3114 |
WSR140024D |
|
|
Triikivaara |
Granodiorite |
Metagranodioritoid |
|
Haparanda suite |
Pajala Shear Zone, West |
Svecokarelian Orogen |
Norrbotten lithotectonic unit |
|
Intrusive rock GDG/GSDG c. 1.96-1.87 Ga (Early Svecokarelian) |
AGES (Automated Gas Extraction System) facility at Vrije Universiteit, Amsterdam |
6 |
Ar-Ar |
Step-wise heating |
K-feldspar |
Plateau age |
1440.0 |
13.0 |
13.0 |
13.0 |
|
|
|
|
|
|
|
|
4 |
Cooling age |
Not classified |
Alkali feldspar displays a distinct staircase pattern with a lower age of 1219 ± 9 Ma (2s) and an upper age of 1440 ± 13 Ma (2s) |
Djuly 2018 |
Djuly, T., 2018: The Thermal and Tectonic history of the Palaeoproterozoic Pajala Shear Zone constrained by 40Ar/39Ar thermochronology. Thesis for MSc, Earth Sciences, Vrije Universiteit, Amsterdam, 259 pp. |
https://doi.org/10.13140/RG.2.2.25250.03522 |
2018 |
|
xxx |
Oct 28, 2025, 4:37:34 PM |
fhm |
1 |
7467444 |
836410 |
|
|
|
28M3a |
| alder.3115 |
3115 |
WSR140024D |
|
|
Triikivaara |
Granodiorite |
Metagranodioritoid |
|
Haparanda suite |
Pajala Shear Zone, West |
Svecokarelian Orogen |
Norrbotten lithotectonic unit |
|
Intrusive rock GDG/GSDG c. 1.96-1.87 Ga (Early Svecokarelian) |
AGES (Automated Gas Extraction System) facility at Vrije Universiteit, Amsterdam |
6 |
Ar-Ar |
Step-wise heating |
Biotite |
Plateau age |
1757.0 |
15.0 |
15.0 |
15.0 |
|
|
|
|
|
|
|
|
4 |
Cooling age |
Not classified |
The biotite experiment shows a relatively reliable plateau age of 1757±15 Ma (2s) |
Djuly 2018 |
Djuly, T., 2018: The Thermal and Tectonic history of the Palaeoproterozoic Pajala Shear Zone constrained by 40Ar/39Ar thermochronology. Thesis for MSc, Earth Sciences, Vrije Universiteit, Amsterdam, 259 pp. |
https://doi.org/10.13140/RG.2.2.25250.03522 |
2018 |
|
xxx |
Oct 28, 2025, 4:37:34 PM |
fhm |
1 |
7467444 |
836410 |
|
|
|
28M3a |
| alder.3116 |
3116 |
WSR140024D |
|
|
Triikivaara |
Granodiorite |
Metagranodioritoid |
|
Haparanda suite |
Pajala Shear Zone, West |
Svecokarelian Orogen |
Norrbotten lithotectonic unit |
|
Intrusive rock GDG/GSDG c. 1.96-1.87 Ga (Early Svecokarelian) |
AGES (Automated Gas Extraction System) facility at Vrije Universiteit, Amsterdam |
6 |
Ar-Ar |
Step-wise heating |
Hornblende |
Plateau age |
1803.0 |
21.0 |
21.0 |
21.0 |
|
|
|
|
|
|
|
|
4 |
Cooling age |
Not classified |
In the last heating steps of the hornblende experiment, a plateau age of 1803±21 Ma (2s) is interpreted. |
Djuly 2018 |
Djuly, T., 2018: The Thermal and Tectonic history of the Palaeoproterozoic Pajala Shear Zone constrained by 40Ar/39Ar thermochronology. Thesis for MSc, Earth Sciences, Vrije Universiteit, Amsterdam, 259 pp. |
https://doi.org/10.13140/RG.2.2.25250.03522 |
2018 |
|
xxx |
Oct 28, 2025, 4:37:34 PM |
fhm |
1 |
7467444 |
836410 |
|
|
|
28M3a |
| alder.3117 |
3117 |
WSR140028C |
|
|
Kukkoahonjänkkä |
Metaargillite |
Metapelite/metaargillite-micaschist |
|
Greenstone group |
Pajala Shear Zone, Central |
Svecokarelian Orogen |
Överkalix lithotectonic unit |
|
Supracrustal rock c. 2.4-1.96 Ga (Karelian) |
AGES (Automated Gas Extraction System) facility at Vrije Universiteit, Amsterdam |
6 |
Ar-Ar |
Step-wise heating |
K-feldspar |
Plateau age |
1360.0 |
13.0 |
13.0 |
13.0 |
|
|
|
|
|
|
|
|
4 |
Cooling age |
Not classified |
The alkali feldspar displays a distinct staircase pattern with a lower age of 1360 ± 13 Ma (2s) and an upper age of 1486 ± 11 Ma (2s) |
Djuly 2018 |
Djuly, T., 2018: The Thermal and Tectonic history of the Palaeoproterozoic Pajala Shear Zone constrained by 40Ar/39Ar thermochronology. Thesis for MSc, Earth Sciences, Vrije Universiteit, Amsterdam, 259 pp. |
https://doi.org/10.13140/RG.2.2.25250.03522 |
2018 |
|
xxx |
Oct 28, 2025, 4:37:34 PM |
fhm |
1 |
7479250 |
856318 |
|
|
|
28M5e |
| alder.3118 |
3118 |
WSR140028C |
|
|
Kukkoahonjänkkä |
Metaargillite |
Metapelite/metaargillite-micaschist |
|
Greenstone group |
Pajala Shear Zone, Central |
Svecokarelian Orogen |
Överkalix lithotectonic unit |
|
Supracrustal rock c. 2.4-1.96 Ga (Karelian) |
AGES (Automated Gas Extraction System) facility at Vrije Universiteit, Amsterdam |
6 |
Ar-Ar |
Step-wise heating |
K-feldspar |
Plateau age |
1486.0 |
11.0 |
11.0 |
11.0 |
|
|
|
|
|
|
|
|
4 |
Cooling age |
Not classified |
The alkali feldspar displays a distinct staircase pattern with a lower age of 1360 ± 13 Ma (2s) and an upper age of 1486 ± 11 Ma (2s) |
Djuly 2018 |
Djuly, T., 2018: The Thermal and Tectonic history of the Palaeoproterozoic Pajala Shear Zone constrained by 40Ar/39Ar thermochronology. Thesis for MSc, Earth Sciences, Vrije Universiteit, Amsterdam, 259 pp. |
https://doi.org/10.13140/RG.2.2.25250.03522 |
2018 |
|
xxx |
Oct 28, 2025, 4:37:34 PM |
fhm |
1 |
7479250 |
856318 |
|
|
|
28M5e |
| alder.3119 |
3119 |
WSR140028C |
|
|
Kukkoahonjänkkä |
Metaargillite |
Metapelite/metaargillite-micaschist |
|
Greenstone group |
Pajala Shear Zone, Central |
Svecokarelian Orogen |
Överkalix lithotectonic unit |
|
Supracrustal rock c. 2.4-1.96 Ga (Karelian) |
AGES (Automated Gas Extraction System) facility at Vrije Universiteit, Amsterdam |
6 |
Ar-Ar |
Step-wise heating |
Biotite |
Plateau age |
1603.0 |
14.0 |
14.0 |
14.0 |
|
|
|
|
|
|
|
|
4 |
Cooling age |
Not classified |
The biotite experiment shows a relatively stable plateau age of 1603 ± 14 Ma (2s) |
Djuly 2018 |
Djuly, T., 2018: The Thermal and Tectonic history of the Palaeoproterozoic Pajala Shear Zone constrained by 40Ar/39Ar thermochronology. Thesis for MSc, Earth Sciences, Vrije Universiteit, Amsterdam, 259 pp. |
https://doi.org/10.13140/RG.2.2.25250.03522 |
2018 |
|
xxx |
Oct 28, 2025, 4:37:34 PM |
fhm |
1 |
7479250 |
856318 |
|
|
|
28M5e |
| alder.3120 |
3120 |
TDY140025C |
|
|
Riukanjänkkä |
Paragneiss |
Meta-arenite/pelite or hornblende-biotite gneiss |
|
Kovo group |
Pajala Shear Zone, East |
Svecokarelian Orogen |
Överkalix lithotectonic unit |
|
Supracrustal rock c. 2.39-2.33 Ga |
AGES (Automated Gas Extraction System) facility at Vrije Universiteit, Amsterdam |
6 |
Ar-Ar |
Step-wise heating |
K-feldspar |
Plateau age |
1223.0 |
10.0 |
10.0 |
10.0 |
|
|
|
|
|
|
|
|
4 |
Cooling age |
Not classified |
The alkali feldspar experiment displays a distinct staircase pattern with a lower age of 1223 ± 10 Ma (2s) and an upper age of 1382 ± 11 Ma 2s) |
Djuly 2018 |
Djuly, T., 2018: The Thermal and Tectonic history of the Palaeoproterozoic Pajala Shear Zone constrained by 40Ar/39Ar thermochronology. Thesis for MSc, Earth Sciences, Vrije Universiteit, Amsterdam, 259 pp. |
https://doi.org/10.13140/RG.2.2.25250.03522 |
2018 |
|
xxx |
Oct 28, 2025, 4:37:34 PM |
fhm |
1 |
7455418 |
876425 |
|
|
|
28M0i |
| alder.3121 |
3121 |
TDY140025C |
|
|
Riukanjänkkä |
Paragneiss |
Meta-arenite/pelite or hornblende-biotite gneiss |
|
Kovo group |
Pajala Shear Zone, East |
Svecokarelian Orogen |
Överkalix lithotectonic unit |
|
Supracrustal rock c. 2.39-2.33 Ga |
AGES (Automated Gas Extraction System) facility at Vrije Universiteit, Amsterdam |
6 |
Ar-Ar |
Step-wise heating |
K-feldspar |
Plateau age |
1382.0 |
11.0 |
11.0 |
11.0 |
|
|
|
|
|
|
|
|
4 |
Cooling age |
Not classified |
The alkali feldspar experiment displays a distinct staircase pattern with a lower age of 1223 ± 10 Ma (2s) and an upper age of 1382 ± 11 Ma (2s) |
Djuly 2018 |
Djuly, T., 2018: The Thermal and Tectonic history of the Palaeoproterozoic Pajala Shear Zone constrained by 40Ar/39Ar thermochronology. Thesis for MSc, Earth Sciences, Vrije Universiteit, Amsterdam, 259 pp. |
https://doi.org/10.13140/RG.2.2.25250.03522 |
2018 |
|
xxx |
Oct 28, 2025, 4:37:34 PM |
fhm |
1 |
7455418 |
876425 |
|
|
|
28M0i |
| alder.3122 |
3122 |
TDY140025C |
|
|
Riukanjänkkä |
Paragneiss |
Meta-arenite/pelite or hornblende-biotite gneiss |
|
Kovo group |
Pajala Shear Zone, East |
Svecokarelian Orogen |
Överkalix lithotectonic unit |
|
Supracrustal rock c. 2.39-2.33 Ga |
AGES (Automated Gas Extraction System) facility at Vrije Universiteit, Amsterdam |
6 |
Ar-Ar |
Step-wise heating |
Biotite |
Plateau age |
1634.0 |
14.0 |
14.0 |
14.0 |
|
|
|
|
|
|
|
|
4 |
Cooling age |
Not classified |
The biotite experiment shows a relatively stable plateau age of 1634±14 Ma (2s) |
Djuly 2018 |
Djuly, T., 2018: The Thermal and Tectonic history of the Palaeoproterozoic Pajala Shear Zone constrained by 40Ar/39Ar thermochronology. Thesis for MSc, Earth Sciences, Vrije Universiteit, Amsterdam, 259 pp. |
https://doi.org/10.13140/RG.2.2.25250.03522 |
2018 |
|
xxx |
Oct 28, 2025, 4:37:34 PM |
fhm |
1 |
7455418 |
876425 |
|
|
|
28M0i |
| alder.3123 |
3123 |
TDY140025C |
|
|
Riukanjänkkä |
Paragneiss |
Meta-arenite/pelite or hornblende-biotite gneiss |
|
Kovo group |
Pajala Shear Zone, East |
Svecokarelian Orogen |
Överkalix lithotectonic unit |
|
Supracrustal rock c. 2.39-2.33 Ga |
AGES (Automated Gas Extraction System) facility at Vrije Universiteit, Amsterdam |
6 |
Ar-Ar |
Step-wise heating |
Hornblende |
Plateau age |
1726.0 |
29.0 |
29.0 |
29.0 |
|
|
|
|
|
|
|
|
4 |
Cooling age |
Not classified |
The hornblende experiment displays an age plateau of 1726±29 Ma (2s). |
Djuly 2018 |
Djuly, T., 2018: The Thermal and Tectonic history of the Palaeoproterozoic Pajala Shear Zone constrained by 40Ar/39Ar thermochronology. Thesis for MSc, Earth Sciences, Vrije Universiteit, Amsterdam, 259 pp. |
https://doi.org/10.13140/RG.2.2.25250.03522 |
2018 |
|
xxx |
Oct 28, 2025, 4:37:34 PM |
fhm |
1 |
7455418 |
876425 |
|
|
|
28M0i |
| alder.3124 |
3124 |
BAA140016D |
|
|
Saarenvaara |
Paragneiss |
Metawacke/metaarenite or staurolite-biotite paragneiss, fine to medium grained, migmatitic |
|
|
Pajala Shear Zone, West |
Svecokarelian Orogen |
Norrbotten lithotectonic unit |
|
Supracrustal rock c. 1.96-1.86 Ga (Svecofennian) |
AGES (Automated Gas Extraction System) facility at Vrije Universiteit, Amsterdam |
6 |
Ar-Ar |
Step-wise heating |
K-feldspar |
Plateau age |
1536.0 |
11.0 |
11.0 |
11.0 |
|
|
|
|
|
|
|
|
4 |
Cooling age |
Not classified |
The alkali feldspar experiment displays a lower age of 1536 ± 11 (2s) Ma, and an older age of 1606 ± 11 Ma (2s). |
Djuly 2018 |
Djuly, T., 2018: The Thermal and Tectonic history of the Palaeoproterozoic Pajala Shear Zone constrained by 40Ar/39Ar thermochronology. Thesis for MSc, Earth Sciences, Vrije Universiteit, Amsterdam, 259 pp. |
https://doi.org/10.13140/RG.2.2.25250.03522 |
2018 |
|
xxx |
Oct 28, 2025, 4:37:34 PM |
fhm |
1 |
7458252 |
836943 |
|
|
|
28M1a |
| alder.3125 |
3125 |
BAA140016D |
|
|
Saarenvaara |
Paragneiss |
Metawacke/metaarenite or staurolite-biotite paragneiss, fine to medium grained, migmatitic |
|
|
Pajala Shear Zone, West |
Svecokarelian Orogen |
Norrbotten lithotectonic unit |
|
Supracrustal rock c. 1.96-1.86 Ga (Svecofennian) |
AGES (Automated Gas Extraction System) facility at Vrije Universiteit, Amsterdam |
6 |
Ar-Ar |
Step-wise heating |
K-feldspar |
Plateau age |
1606.0 |
11.0 |
11.0 |
11.0 |
|
|
|
|
|
|
|
|
4 |
Cooling age |
Not classified |
The alkali feldspar experiment displays a lower age of 1536 ± 11 (2s) Ma, and an older age of 1606 ± 11 Ma (2s). |
Djuly 2018 |
Djuly, T., 2018: The Thermal and Tectonic history of the Palaeoproterozoic Pajala Shear Zone constrained by 40Ar/39Ar thermochronology. Thesis for MSc, Earth Sciences, Vrije Universiteit, Amsterdam, 259 pp. |
https://doi.org/10.13140/RG.2.2.25250.03522 |
2018 |
|
xxx |
Oct 28, 2025, 4:37:34 PM |
fhm |
1 |
7458252 |
836943 |
|
|
|
28M1a |
| alder.3126 |
3126 |
BAA140016D |
|
|
Saarenvaara |
Paragneiss |
Metawacke/metaarenite or staurolite-biotite paragneiss, fine to medium grained, migmatitic |
|
|
Pajala Shear Zone, West |
Svecokarelian Orogen |
Norrbotten lithotectonic unit |
|
Supracrustal rock c. 1.96-1.86 Ga (Svecofennian) |
AGES (Automated Gas Extraction System) facility at Vrije Universiteit, Amsterdam |
6 |
Ar-Ar |
Step-wise heating |
Biotite |
Plateau age |
1684.0 |
17.0 |
17.0 |
17.0 |
|
|
|
|
|
|
|
|
4 |
Cooling age |
Not classified |
The biotite experiment shows a less stable plateau age of 1684±17 Ma (2s). |
Djuly 2018 |
Djuly, T., 2018: The Thermal and Tectonic history of the Palaeoproterozoic Pajala Shear Zone constrained by 40Ar/39Ar thermochronology. Thesis for MSc, Earth Sciences, Vrije Universiteit, Amsterdam, 259 pp. |
https://doi.org/10.13140/RG.2.2.25250.03522 |
2018 |
|
xxx |
Oct 28, 2025, 4:37:34 PM |
fhm |
1 |
7458252 |
836943 |
|
|
|
28M1a |
| alder.3127 |
3127 |
SLH140067E |
|
|
Huhta-Kuusivaara |
Granite |
Granite, weakly foliated and metamorphosed |
|
Lina suite |
Pajala Shear Zone, Western Shear Zone |
Svecokarelian Orogen |
Överkalix lithotectonic unit |
|
Intrusive rock GP c. 1.83-1.75 Ga |
AGES (Automated Gas Extraction System) facility at Vrije Universiteit, Amsterdam |
6 |
Ar-Ar |
Step-wise heating |
K-feldspar |
Plateau age |
1116.0 |
9.0 |
9.0 |
9.0 |
|
|
|
|
|
|
|
|
4 |
Cooling age |
Not classified |
Stepwise heating experiments performed on alkali feldspar. After an initial old age for the first step, the alkali feldspar experiment display a distinct staircase pattern with a lower age of 1116 ± 9 Ma (2s). and an upper age of 1273 ± 10 Ma (2s). |
Djuly 2018 |
Djuly, T., 2018: The Thermal and Tectonic history of the Palaeoproterozoic Pajala Shear Zone constrained by 40Ar/39Ar thermochronology. Thesis for MSc, Earth Sciences, Vrije Universiteit, Amsterdam, 259 pp. |
https://doi.org/10.13140/RG.2.2.25250.03522 |
2018 |
|
xxx |
Oct 28, 2025, 4:37:34 PM |
fhm |
1 |
7463631 |
846053 |
|
|
|
28M2c |
| alder.3128 |
3128 |
SLH140067E |
|
|
Huhta-Kuusivaara |
Granite |
Granite-pegmatite, weakly foliated and metamorphosed |
|
Lina suite |
Pajala Shear Zone, Western Shear Zone |
Svecokarelian Orogen |
Överkalix lithotectonic unit |
|
Intrusive rock GP c. 1.83-1.75 Ga |
AGES (Automated Gas Extraction System) facility at Vrije Universiteit, Amsterdam |
6 |
Ar-Ar |
Step-wise heating |
K-feldspar |
Plateau age |
1273.0 |
10.0 |
10.0 |
10.0 |
|
|
|
|
|
|
|
|
4 |
Cooling age |
Not classified |
Stepwise heating experiments performed on alkali feldspar. After an initial old age for the first step, the alkali feldspar experiment display a distinct staircase pattern with a lower age of 1116±9 Ma (2s). and an upper age of 1273 ± 10 Ma (2s). |
Djuly 2018 |
Djuly, T., 2018: The Thermal and Tectonic history of the Palaeoproterozoic Pajala Shear Zone constrained by 40Ar/39Ar thermochronology. Thesis for MSc, Earth Sciences, Vrije Universiteit, Amsterdam, 259 pp. |
https://doi.org/10.13140/RG.2.2.25250.03522 |
2018 |
|
xxx |
Oct 28, 2025, 4:37:34 PM |
fhm |
1 |
7463631 |
846053 |
|
|
|
28M2c |
| alder.3129 |
3129 |
SLH140067E |
|
|
Huhta-Kuusivaara |
Granite |
Granite-pegmatite, weakly foliated and metamorphosed |
|
Lina suite |
Pajala Shear Zone, Western Shear Zone |
Svecokarelian Orogen |
Överkalix lithotectonic unit |
|
Intrusive rock GP c. 1.83-1.75 Ga |
AGES (Automated Gas Extraction System) facility at Vrije Universiteit, Amsterdam |
6 |
Ar-Ar |
Step-wise heating |
Biotite |
Plateau age |
1583.0 |
9.0 |
9.0 |
9.0 |
|
|
|
|
|
|
|
|
4 |
Cooling age |
Not classified |
The biotite experiment shows a relatively stable plateau age of 1583±9 Ma (2s). |
Djuly 2018 |
Djuly, T., 2018: The Thermal and Tectonic history of the Palaeoproterozoic Pajala Shear Zone constrained by 40Ar/39Ar thermochronology. Thesis for MSc, Earth Sciences, Vrije Universiteit, Amsterdam, 259 pp. |
https://doi.org/10.13140/RG.2.2.25250.03522 |
2018 |
|
xxx |
Oct 28, 2025, 4:37:34 PM |
fhm |
1 |
7463631 |
846053 |
|
|
|
28M2c |
| alder.3130 |
3130 |
SLH140069D |
|
|
Liviövuoma |
Schist |
Biotite-muscovite greenschist |
|
|
Pajala Shear Zone, Western Shear Zone |
Svecokarelian Orogen |
Överkalix lithotectonic unit |
|
Supracrustal rock c. 1.96-1.86 Ga (Svecofennian) |
AGES (Automated Gas Extraction System) facility at Vrije Universiteit, Amsterdam |
6 |
Ar-Ar |
Step-wise heating |
Biotite |
Plateau age |
1615.0 |
13.0 |
13.0 |
13.0 |
|
|
|
|
|
|
|
|
4 |
Cooling age |
Not classified |
The stepwise heating experiments performed on biotite shows an age plateau of 1615 ± 13 Ma (2s) |
Djuly 2018 |
Djuly, T., 2018: The Thermal and Tectonic history of the Palaeoproterozoic Pajala Shear Zone constrained by 40Ar/39Ar thermochronology. Thesis for MSc, Earth Sciences, Vrije Universiteit, Amsterdam, 259 pp. |
https://doi.org/10.13140/RG.2.2.25250.03522 |
2018 |
|
xxx |
Oct 28, 2025, 4:37:34 PM |
fhm |
1 |
7477973 |
851256 |
|
|
|
28M5d |
| alder.3131 |
3131 |
STB971001 |
|
|
Jårkastakka, Raketskjutsfältet road cut |
Paragneiss |
Paragneiss, muscovite grows across biotite foliation |
|
Archean |
|
Svecokarelian Orogen |
Norrbotten lithotectonic unit |
|
Stratigraphic position unknown |
Scottish Universities Research and Reactor Centre (SURRC) |
6 |
Ar-Ar |
Step-wise heating |
Muscovite |
Plateau age |
1557.0 |
18.0 |
18.0 |
18.0 |
|
|
|
|
12 |
10 |
2.5999999 |
|
0 |
not known |
Not classified |
Weighted mean plateau age of muscovite: 1557.3 ± 9.1 Ma (1s), interpreted to represent either cooling age/resetting or neocrystallisation. |
Billström et al 2025 |
Billström, K., Bergman, S., Mark, C. & Barfod, D.N., 2025: New 40Ar/39Ar mineral ages of Archaean to early Proterozoic rocks in northern Sweden and implications for the 1.8–1.5 Ga tectonothermal history of northernmost Fennoscandia. International Journal of Earth Sciences 114, 347–368. |
https://doi.org/10.1007/s00531-024-02488-6 |
2025 |
|
xxx |
Oct 29, 2025, 10:10:28 AM |
fhm |
1 |
7588690 |
766416 |
|
|
|
30K7g |
| alder.3132 |
3132 |
STB971002 |
|
|
Jårkastakka, Raketskjutfältet road cut |
Doleritic rock |
Diabase, strongly foliated and sheared rock |
|
Kovo group |
|
Svecokarelian Orogen |
Norrbotten lithotectonic unit |
|
Intrusive rock c. 2.4-1.96 Ga (Karelian) |
Scottish Universities Research and Reactor Centre (SURRC) |
6 |
Ar-Ar |
Step-wise heating |
Hornblende |
Plateau age |
1801.0 |
20.0 |
20.0 |
20.0 |
|
|
|
|
12 |
10 |
110.0 |
|
4 |
Cooling age |
Not classified |
Weighted mean plateau age of hornblende: 1801.4 ± 9.8 Ma (1s). Signs of excess argon add uncertainties, interpreted to represent either cooling age/resetting or neocrystallisation. |
Billström et al 2025 |
Billström, K., Bergman, S., Mark, C. & Barfod, D.N., 2025: New 40Ar/39Ar mineral ages of Archaean to early Proterozoic rocks in northern Sweden and implications for the 1.8–1.5 Ga tectonothermal history of northernmost Fennoscandia. International Journal of Earth Sciences 114, 347–368. |
https://doi.org/10.1007/s00531-024-02488-6 |
2025 |
|
xxx |
Oct 29, 2025, 6:02:46 PM |
fhm |
1 |
7587554 |
766771 |
|
|
|
30K7g |
| alder.3133 |
3133 |
STB971003 |
|
|
Jårkastakka, Raketskjutfältet road cut |
Doleritic rock |
Diabase |
|
Kovo group |
|
Svecokarelian Orogen |
Norrbotten lithotectonic unit |
|
Intrusive rock c. 2.4-1.96 Ga (Karelian) |
Scottish Universities Research and Reactor Centre (SURRC) |
6 |
Ar-Ar |
Step-wise heating |
Hornblende |
Plateau age |
1766.0 |
19.0 |
19.0 |
19.0 |
|
|
|
|
12 |
10 |
70.0 |
|
4 |
Cooling age |
Not classified |
Weighted mean plateau age of hornblende: 1765.8 ± 9.7 Ma (1s), interpreted to represent either cooling ages/resetting or neocrystallisation. |
Billström et al 2025 |
Billström, K., Bergman, S., Mark, C. & Barfod, D.N., 2025: New 40Ar/39Ar mineral ages of Archaean to early Proterozoic rocks in northern Sweden and implications for the 1.8–1.5 Ga tectonothermal history of northernmost Fennoscandia. International Journal of Earth Sciences 114, 347–368. |
https://doi.org/10.1007/s00531-024-02488-6 |
2025 |
|
xxx |
Oct 29, 2025, 6:02:46 PM |
fhm |
1 |
7587486 |
766872 |
|
|
|
30K7g |
| alder.3134 |
3134 |
STB971005 |
|
|
Akkisvaara, Raketskjutfältet road cut |
Mafic rock |
Mafic volcanic? rock, fine-grained. Unit immediately below Tjärro quartzite |
|
|
|
Svecokarelian Orogen |
Norrbotten lithotectonic unit |
|
Stratigraphic position unknown |
Scottish Universities Research and Reactor Centre (SURRC) |
6 |
Ar-Ar |
Step-wise heating |
Hornblende |
Plateau age |
1611.0 |
18.0 |
18.0 |
18.0 |
|
|
|
|
12 |
9 |
210.0 |
|
0 |
not known |
Not classified |
Hornblende yielded a range of ages between ca 1.65 and 1.60 Ga with weighted mean plateau age: 1611.3 ± 8.9 Ma (1s), interpreted to represent either cooling ages/resetting or neocrystallisation. |
Billström et al 2025 |
Billström, K., Bergman, S., Mark, C. & Barfod, D.N., 2025: New 40Ar/39Ar mineral ages of Archaean to early Proterozoic rocks in northern Sweden and implications for the 1.8–1.5 Ga tectonothermal history of northernmost Fennoscandia. International Journal of Earth Sciences 114, 347–368. |
https://doi.org/10.1007/s00531-024-02488-6 |
2025 |
|
xxx |
Oct 29, 2025, 6:02:46 PM |
fhm |
1 |
7583170 |
777887 |
|
|
|
30K6i |
| alder.3135 |
3135 |
STB971009A |
|
|
Kautisvaara, 6 km SE of Lannavaara |
Quartzite |
Feldspar-quartzite, Post-muscovite in fold hinge |
|
Pahakurkkio group |
|
Svecokarelian Orogen |
Norrbotten lithotectonic unit |
|
Supracrustal rock c. 1.96-1.86 Ga (Svecofennian) |
Scottish Universities Research and Reactor Centre (SURRC) |
6 |
Ar-Ar |
Step-wise heating |
Muscovite |
Plateau age |
1564.0 |
19.0 |
19.0 |
19.0 |
|
|
|
|
15 |
12 |
28.0 |
|
0 |
not known |
Not classified |
Weighted mean plateau age of muscovite: 1564.3 ± 9.4 Ma (1s), interpreted to represent either cooling age/resetting or neocrystallisation. |
Billström et al 2025 |
Billström, K., Bergman, S., Mark, C., Barfod, D.N., 2025: New 40Ar/39Ar mineral ages of Archaean to early Proterozoic rocks in northern Sweden and implications for the 1.8–1.5 Ga tectonothermal history of northernmost Fennoscandia. International Journal of Earth Sciences 114, 347–368. |
https://doi.org/10.1007/s00531-024-02488-6 |
2025 |
|
xxx |
Oct 29, 2025, 6:02:46 PM |
fhm |
1 |
7561819 |
796745 |
|
|
|
30L2c |
| alder.3136 |
3136 |
STB971009B |
|
|
Kautisvaara, 6 km SE of Lannavaara |
Quartzite |
Feldspar-quartzite, Post- muscovite in fold limb |
|
Pahakurkkio group |
|
Svecokarelian Orogen |
Norrbotten lithotectonic unit |
|
Supracrustal rock c. 1.96-1.86 Ga (Svecofennian) |
Scottish Universities Research and Reactor Centre (SURRC) |
6 |
Ar-Ar |
Step-wise heating |
Muscovite |
Plateau age |
1565.0 |
6.0 |
6.0 |
6.0 |
|
|
|
|
|
|
|
|
0 |
not known |
Not classified |
Weighted mean plateau age of muscovite: 1565 ± 3.2 Ma (1s), interpreted to represent either cooling age/resetting or neocrystallisation. |
Billström et al 2025 |
Billström, K., Bergman, S., Mark, C. & Barfod, D.N., 2025: New 40Ar/39Ar mineral ages of Archaean to early Proterozoic rocks in northern Sweden and implications for the 1.8–1.5 Ga tectonothermal history of northernmost Fennoscandia. International Journal of Earth Sciences 114, 347–368. |
https://doi.org/10.1007/s00531-024-02488-6 |
2025 |
|
xxx |
Oct 29, 2025, 6:02:46 PM |
fhm |
1 |
7561819 |
796745 |
|
|
|
30L2c |
| alder.3137 |
3137 |
STB971010 |
|
|
Lannavaara, 1 km E of |
Doleritic rock |
Mafic sill intruding greenstones, more or less isotropic rock |
|
|
|
Svecokarelian Orogen |
Norrbotten lithotectonic unit |
|
Stratigraphic position unknown |
Scottish Universities Research and Reactor Centre (SURRC) |
6 |
Ar-Ar |
Step-wise heating |
Hornblende |
Plateau age |
1724.0 |
19.0 |
19.0 |
19.0 |
|
|
|
|
14 |
6 |
46.0 |
|
0 |
not known |
Not classified |
Weighted mean plateau age of hornblende: 1723.8 ± 9.5 Ma (1s), interpreted to represent either cooling ages/resetting or neocrystallisation. |
Billström et al 2025 |
Billström, K., Bergman, S., Mark, C. & Barfod, D.N., 2025: New 40Ar/39Ar mineral ages of Archaean to early Proterozoic rocks in northern Sweden and implications for the 1.8–1.5 Ga tectonothermal history of northernmost Fennoscandia. International Journal of Earth Sciences 114, 347–368. |
https://doi.org/10.1007/s00531-024-02488-6 |
2025 |
|
xxx |
Oct 29, 2025, 6:02:46 PM |
fhm |
1 |
7564587 |
791219 |
|
|
|
30L2b |
| alder.3138 |
3138 |
STB971012 |
|
|
Takanenvaara |
Paragneiss |
Paragneiss, High-grade rock with post-deformative muscovite |
|
|
|
Svecokarelian Orogen |
Norrbotten lithotectonic unit |
|
Supracrustal rock c. 1.96-1.86 Ga (Svecofennian) |
Scottish Universities Research and Reactor Centre (SURRC) |
6 |
Ar-Ar |
Step-wise heating |
Muscovite |
Plateau age |
1620.0 |
4.0 |
4.0 |
4.0 |
|
|
|
|
12 |
12 |
12.0 |
|
0 |
not known |
Not classified |
Weighted mean plateau age of muscovite: 1619.8 ± 1.8 (1s), interpreted to represent either cooling age/resetting or neocrystallisation. |
Billström et al 2025 |
Billström, K., Bergman, S., Mark, C. & Barfod, D.N., 2025: New 40Ar/39Ar mineral ages of Archaean to early Proterozoic rocks in northern Sweden and implications for the 1.8–1.5 Ga tectonothermal history of northernmost Fennoscandia. International Journal of Earth Sciences 114, 347–368. |
https://doi.org/10.1007/s00531-024-02488-6 |
2025 |
|
xxx |
Oct 29, 2025, 6:02:46 PM |
fhm |
1 |
7478671 |
809305 |
|
|
|
28L5e |
| alder.3139 |
3139 |
STB971007 |
|
|
Kätkijärvi |
Quartzite |
Quartzite |
|
|
|
Svecokarelian Orogen |
Norrbotten lithotectonic unit |
|
Stratigraphic position unknown |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
207Pb/206Pb age |
|
|
|
|
2700.0 |
2800.0 |
|
|
7 |
|
|
|
3 |
Detrital age |
Not classified |
Zircons are mainly rounded, although more prismatic habitus also exist. Internal structures are quite complex including cores and dissolution-reprecipitation features. The U–Pb zircon data, being variably discordant. Still, as suggested from more concorda Still, as suggested from more concordant data, at least two Archaean protoliths of different ages at c. 2.8 Ga and 2.7 Ga are indicated. The rock is representative of a Tjärro-type of sediment that is composed of Archaean erosional material. |
Billström et al 2025 |
Billström, K., Bergman, S., Mark, C., Barfod, D.N., 2025: New 40Ar/39Ar mineral ages of Archaean to early Proterozoic rocks in northern Sweden and implications for the 1.8–1.5 Ga tectonothermal history of northernmost Fennoscandia. International Journal of Earth Sciences 114, 347–368. |
https://doi.org/10.1007/s00531-024-02488-6 |
2025 |
|
xxx |
Oct 29, 2025, 6:02:46 PM |
fhm |
1 |
7597533 |
794987 |
|
|
|
30L9c |
| alder.3140 |
3140 |
STB971113A |
|
|
Maattavaara |
Felsic rock |
Felsic dyke |
|
|
|
Svecokarelian Orogen |
Norrbotten lithotectonic unit |
|
Stratigraphic position unknown |
Laboratory for Isotope Geology, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
ID-TIMS |
Monazite |
Upper intercept age |
1633.0 |
7.0 |
7.0 |
7.0 |
|
|
|
|
3 |
3 |
|
|
5 |
Magmatic age |
Not classified |
Monazite, yellowish green and mostly turbid grains, were split into three fractions. U-Pb analyses yielded an upper intercept age of 1633 ± 7 Ma, interpreted as the magmatic crystallisation age of the felsic intrusion, setting the minimum depositional age of the Maattavaara quartzite being intruded by the intrusion. |
Billström et al 2025 |
Billström, K., Bergman, S., Mark, C., Barfod, D.N., 2025: New 40Ar/39Ar mineral ages of Archaean to early Proterozoic rocks in northern Sweden and implications for the 1.8–1.5 Ga tectonothermal history of northernmost Fennoscandia. International Journal of Earth Sciences 114, 347–368. |
https://doi.org/10.1007/s00531-024-02488-6 |
2025 |
|
xxx |
Oct 29, 2025, 6:02:46 PM |
fhm |
1 |
7455831 |
750701 |
|
|
|
29K8f |
| alder.3141 |
3141 |
|
|
|
Lake Mien, two cobble sample at the southern shore of the lake and one glacial boulder sample from an old gravel pit south of the lake |
Unknown |
Two samples of impact melt rocks and one sample of a suevitic breccia. |
Mien impact |
|
|
Unknown |
unknown |
|
Stratigraphic position unknown |
Nordsim, Swedish Museum of Natural History, Stockholm |
1 |
U-Pb |
SIMS |
Zircon |
Concordant age |
120.0 |
1.0 |
1.0 |
1.0 |
|
|
|
|
145 |
10 |
1.5 |
0.08 |
1 |
Metamorphic age |
Not classified |
Zircons from two impact melt rocks and one suevitic breccia. Pristine U-Pb zircon data plot preferentially near the upper intercept and microporous zircon data are distributed along the discordia. Intercept ages for the three samples are 1694 ± 58 Ma and 112.8 ± 7.0 Ma (MSWD = 110, n = 64), 1724 ± 38 Ma and 116.7 ± 5.0 Ma (MSWD = 21, n = 63), and at 1689 ± 120 Ma and 81 ± 41 Ma (MSWD = 197, n = 18). At the lower intercept of the discordant array, 32 data points are concordant. Ten of these data points cluster tightly at c. 120 Ma, with 16 points giving older dates, spreading back along the discordia trend, and six giving younger dates down to c. 95 Ma. The population of the 10 data points that are statistically indistinguishable in concordia space give a concordia age of 120.0 ± 1.0 Ma (MSWD = 1.5,p = 0.08, n = 10) which overlaps with the statistically poorly fit lower intercepts of all data points. The weighted mean 238U/206Pb date is 119.8 ± 1.0 Ma (MSWD = 1.9; p = 0.06, n=9). The c |
Herrmann et al 2024 |
Herrmann, M., Kenny, G.G., Martell, J., Whitehouse, M.J. & Alwmark, C., 2024: The first U–Pb age for shocked zircon from the Mien impact structure, Sweden, and implications for metamictization-induced zircon texture formed during impact events. Meteoritics & Planetary Science 59, 211–241 |
https://doi.org/10.1111/maps.14116 |
2024 |
|
xxx |
Oct 30, 2025, 8:40:13 AM |
fhm |
1 |
6249821 |
490000 |
|
|
|
4E0i |
| alder.3142 |
3142 |
|
M15 & M17 |
|
Lake Mien |
Unknown |
impact melt rock (two samples of glacial drift boulders) |
Mien impact |
|
|
Unknown |
unknown |
|
Stratigraphic position unknown |
|
6 |
Ar-Ar |
Step-wise heating |
Whole rock |
Plateau age |
121.0 |
2.0 |
2.0 |
2.0 |
|
|
|
|
|
|
|
|
1 |
Metamorphic age |
Not classified |
Average age of plateau fractions of samples M15 and M17 is 121 ± 2.3 Ma. Ages are updated to the decay constants of Steiger & Jäger (1977), orginal data in: Bottomley, R.J., York, D. & Grieve, R.A.F. 40Ar-39Ar ages of scandinavian impact structures: I Mien and Siljan. Contr. Mineral. and Petrol. 68, 79–84 (1978). |
Bottomley et al 1990 |
Bottomley, R., York, D.& Grieve, R., 1990: Argon-40-argon-39 dating of impact craters. Proceedings of the 20th Lunar and Planetary Science Conference, 421–431. |
https://articles.adsabs.harvard.edu/pdf/1990LPSC...20..421B |
1990 |
|
xxx |
Oct 30, 2025, 8:50:33 AM |
fhm |
1 |
6252463 |
491773 |
|
|
|
4E0i |
| alder.3143 |
3143 |
|
S3A 338 & S3B 370 |
|
Siljan |
Unknown |
Impact melt rock from a small dikelet, two samples of |
Siljan impact |
|
|
Unknown |
unknown |
|
Stratigraphic position unknown |
|
6 |
Ar-Ar |
Step-wise heating |
Whole rock |
Plateau age |
368.0 |
1.0 |
1.0 |
1.0 |
|
|
|
|
|
|
|
|
1 |
Metamorphic age |
Not classified |
Age of the plateau fractions is 365 Ma and the total integrated age is 338 ± 1.1 Ma, the latter was taken as the best age estimate of the impact. Ages are updated to the decay constants of Steiger & Jäger (1977), orginal data in: Bottomley, R.J., York, D. & Grieve, R.A.F. 40Ar-39Ar ages of scandinavian impact structures: I Mien and Siljan. Contr. Mineral. and Petrol. 68, 79–84 (1978). |
Bottomley et al 1990 |
Bottomley, R., York, D.& Grieve, R., 1990: Argon-40-argon-39 dating of impact craters. Proceedings of the 20th Lunar and Planetary Science Conference, 421–431. |
https://articles.adsabs.harvard.edu/pdf/1990LPSC...20..421B |
1990 |
|
xxx |
Oct 30, 2025, 2:09:08 PM |
fhm |
1 |
6766507 |
492796 |
|
|
|
14E3j |
| alder.3144 |
3144 |
|
D 3 396, D3 404, D1 423, D5 362, D6 412, D 6 323 |
|
Dellen |
Unknown |
Impact melt rock consisting of partially decitrified glass with felspar phenocrysts laths up to 1 mm long are rare pyroxene phenocrysts. Clasts are rare. |
Dellen impact |
|
|
Unknown |
unknown |
|
Stratigraphic position unknown |
|
6 |
Ar-Ar |
Step-wise heating |
Whole rock |
Plateau age |
102.0 |
2.0 |
2.0 |
2.0 |
|
|
|
|
|
|
|
|
1 |
Metamorphic age |
Not classified |
Dellen spectra fall in two families,both show good plateau, but one is c 100 Ma (D 3 396, D3 404, D1 423, D5 362), and the other c. 240 Ma (D6 412, D 6 323). The average of the plateaus of the younger samples at 102 ± 1.6 Ma was taken as the best age estimate of the impact. |
Bottomley et al 1990 |
Bottomley, R., York, D.& Grieve, R., 1990: Argon-40-argon-39 dating of impact craters. Proceedings of the 20th Lunar and Planetary Science Conference, 421–431. |
https://articles.adsabs.harvard.edu/pdf/1990LPSC...20..421B |
1990 |
|
xxx |
Oct 30, 2025, 3:27:30 PM |
fhm |
1 |
6865847 |
580525 |
|
|
|
16G3h |
| alder.3145 |
3145 |
|
ASSE16.01 |
|
Delsjön |
Orthogneiss |
Migmatitic orthogneiss |
|
Göteborg suite |
Median segment |
Sveconorwegian Orogen |
Idefjorden Terrane |
|
Intrusive rock GDG c. 1.62-1.59 Ga |
Department of Geology, Lund University |
1 |
U-Pb |
Laser ICP-MS |
Zircon |
Weighted average 207Pb/206Pb age |
1598.0 |
7.0 |
7.0 |
7.0 |
|
|
|
|
|
19 |
0.88999999 |
|
5 |
Magmatic age |
Not classified |
Zircons have oscillatory zoned magmatic cores and metamorfic rim domains. Th/U for cores are 0.23-1.24, and 0.001-0.009 for rims (concordant data). The older population of concordant data from cores give a weighted mean age of 207Pb/ 206Pb = 1598 ± 6.6 Ma (MSWD = 0,89, n = 19), intrepreted as the magmatic age of the gneiss protolith. Three concordant analyses are sigificant older, interpreted as inherited and excluded from abobe age calculation. The weigthed average 207Pb/ 206Pb age for metamorphic rims using concordant data is 1002 ± 9 Ma (MSWD = 0,09, n = 9). |
Ingered 2017 |
Ingered, M., 2017: U-Pb datering av zirkon från migmatitisk gnejs i Delsjöområdet, Idefjordenterrängen. Examensarbeten i geologi vid Lunds universitet, kandidatarbete, nr 512, 35 pp. |
https://lup.lub.lu.se/luur/download?func=downloadFile&recordOId=8918456&fileOId=8918460 |
2017 |
|
xxx |
Nov 3, 2025, 7:20:44 AM |
fhm |
1 |
6398966 |
323869 |
|
|
|
7B0f |
| alder.3146 |
3146 |
|
ASSE16.01 |
|
Delsjön |
Orthogneiss |
Migmatitic orthogneiss |
|
Göteborg suite |
Median segment |
Sveconorwegian Orogen |
Idefjorden Terrane |
|
Intrusive rock GDG c. 1.62-1.59 Ga |
Department of Geology, Lund University |
1 |
U-Pb |
Laser ICP-MS |
Zircon |
Weighted average 207Pb/206Pb age |
1002.0 |
9.0 |
9.0 |
9.0 |
|
|
|
|
|
9 |
0.09 |
|
1 |
Metamorphic age |
Not classified |
Zircons have oscillatory zoned magmatic cores and metamorfic rim domains. Th/U for cores are 0.23-1.24, and 0.001-0.009 for rims (concordant data). The older population of concordant data from cores give a weighted mean age of 207Pb/ 206Pb = 1598 ± 6.6 Ma (MSWD = 0,89, n = 19), intrepreted as the magmatic age of the gneiss protolith. Three concordant analyses are sigificant older, interpreted as inherited and excluded from abobe age calculation. The weigthed average 207Pb/ 206Pb age for metamorphic rims using concordant data is 1002 ± 9 Ma (MSWD = 0,09, n = 9). |
Ingered 2017 |
Ingered, M., 2017: U-Pb datering av zirkon från migmatitisk gnejs i Delsjöområdet, Idefjordenterrängen. Examensarbeten i geologi vid Lunds universitet, kandidatarbete, nr 512, 35 pp. |
https://lup.lub.lu.se/luur/download?func=downloadFile&recordOId=8918456&fileOId=8918460 |
2017 |
|
xxx |
Nov 3, 2025, 9:24:29 AM |
fhm |
1 |
6398966 |
323869 |
|
|
|
7B0f |
| alder.3147 |
3147 |
|
22FF002 |
|
Granås |
Granodiorite |
Granodiorite, weakly foliated |
|
Hisingen suite |
Western segment |
Sveconorwegian Orogen |
Idefjorden Terrane |
|
Intrusive rock c. 1.59-1.53 Ga |
Department of Geology, Göteborg University |
1 |
U-Pb |
Laser ICP-MS |
Zircon |
Concordant age |
1556.0 |
8.0 |
8.0 |
8.0 |
|
|
|
|
24 |
9 |
5.80000019 |
|
5 |
Magmatic age |
Not classified |
Zircon crystals show euhedral to subhedral habits with elongated to equant shapes. BSE-images show oscillatory growth zoning in both rims and cores. Rejecting two spots give an upper intercept age of 1556 ± 20 Ma, with a lower intercept at 190 ± 225 Ma, (n=22, MSWD = 20, 95 % conf.). Rejecting all >5% discordant spots and fitting a concordia to the remaining 9 spots yields a concordant age of 1556 ± 8 Ma (MSWD = 5.8) |
Nordqvist 2023 |
Nordqvist, M., 2023: U-Pb zircon dating of the plutonic Hisingen suite in SW Sweden: geochemical classification and evaluation of field methods for differentiation. Bachelor of Science thesis B1181. Department of Earth Sciences, University of Gothenburg, 51 pp. |
https://gupea.ub.gu.se/bitstream/handle/2077/75995/B1181.pdf?sequence=1&isAllowed=y |
2023 |
|
xxx |
Nov 13, 2025, 11:41:29 AM |
fhm |
1 |
6383976 |
322630 |
|
|
|
6B7e |
| alder.3148 |
3148 |
|
22FF005 |
|
Högsered |
Granite |
Granite, K-feldspar porphyric |
|
Hisingen suite |
Western segment |
Sveconorwegian Orogen |
Idefjorden Terrane |
|
Intrusive rock c. 1.59-1.53 Ga |
Department of Geology, Göteborg University |
1 |
U-Pb |
Laser ICP-MS |
Zircon |
Concordant age |
1557.0 |
6.0 |
6.0 |
6.0 |
|
|
|
|
24 |
8 |
2.0 |
|
5 |
Magmatic age |
Not classified |
Zircon crystals show euhedral to subhedral habits with elongated to equant shapes. BSE-images show oscillatory growth zoning in both rims and cores. Excluding one discordant analysis, discordia regression through remaining spots yields an upper intercept age of 1546 ± 12 Ma and 344 ± 565 Ma (n = 23, MSWD = 10, 95 % conf.). Using the eight most concordant spots, between -0.86% and 1.6% relative age difference between the 206Pb/238U and 207Pb/206Pb ages, yields a concordant age of 1557 ± 6 Ma (MSWD = 2). |
Nordqvist 2023 |
Nordqvist, M., 2023: U-Pb zircon dating of the plutonic Hisingen suite in SW Sweden: geochemical classification and evaluation of field methods for differentiation. Bachelor of Science thesis B1181. Department of Earth Sciences, University of Gothenburg, 51 pp. |
https://gupea.ub.gu.se/bitstream/handle/2077/75995/B1181.pdf?sequence=1&isAllowed=y |
2023 |
|
xxx |
Nov 13, 2025, 2:44:26 PM |
fhm |
1 |
6383887 |
321802 |
|
|
|
6B7e |
| alder.3149 |
3149 |
|
Bk1336 |
|
Svartpålstjärnen (SW of Ställdalen) |
Dacite |
Metadacitic volcaniclastic, sample from the level at the top of the ice-wedge cast, which predates formation of the cast. |
|
|
|
Svecokarelian Orogen |
Bergslagen lithotectonic unit |
|
Supracrustal rock c. 1.96-1.86 Ga (Svecofennian) |
Korean Basic Science Institute (KBSI), Seoul |
1 |
U-Pb |
SIMS |
Zircon |
Weighted average 207Pb/206Pb age |
1895.0 |
5.0 |
5.0 |
5.0 |
|
|
|
|
13 |
8 |
0.23 |
|
5 |
Magmatic age |
Not classified |
Most zircons display oscillatory zoning typical for magmatic zircon, further supported by their Th/U ratios >0.1. Eight concordant spots define a weighted mean, 204Pb-corrected, 207Pb/206Pb age of 1895.1 ± 5.0 Ma (MSWD = 0.23).The sample contain also near concordant older, inherited grains. |
Kuipers et al 2021 |
Kuipers, G., Beunk, F.F., Yi, K. & van der Wateren, F.M., 2021: A 1.9 Ga glacial sedimentary-facies association at low palaeolatitude in the Bergslagen Group, Grythyttan Field, Central Sweden, Norwegian Journal of Geology 101 (1), p. 1-18. |
https://dx.doi.org/10.17850/njg101-1-1 |
2021 |
|
xxx |
Nov 14, 2025, 10:22:19 AM |
fhm |
1 |
6640194 |
494815 |
|
6642559 |
1449751 |
11E8j |
| alder.3150 |
3150 |
|
Bk1337 |
|
Svartpålstjärnen (SW of Ställdalen) |
Dacite |
Metadacitic volcaniclastic, sample taken 1.5 m stratigraphically above the top of ice-wedge cast. |
|
|
|
Svecokarelian Orogen |
Bergslagen lithotectonic unit |
|
Supracrustal rock c. 1.96-1.86 Ga (Svecofennian) |
Korean Basic Science Institute (KBSI), Seoul |
1 |
U-Pb |
SIMS |
Zircon |
Weighted average 207Pb/206Pb age |
1901.0 |
5.0 |
5.0 |
5.0 |
|
|
|
|
25 |
18 |
2.0999999 |
|
5 |
Magmatic age |
Not classified |
Most zircons display oscillatory zoning typical for magmatic zircon, further supported by their Th/U ratios >0.1. 18 near-concordant dates produce a pooled, 204Pb-corrected, 207Pb/206Pb age of 1900.7 ± 5.0 Ma with a relatively high MSWD value of 2.1. The sample contain also near concordant older, inherited grains. One grain has an isotopically near-concordant, high-U and low Th/U (0.02) overgrowth, discordant to magmatic zoning, with a 207Pb/206Pb age of 1814 Ma. It was suggested to possibly record the age of the amphibolite-facies metamorphism in the area. |
Kuipers et al 2021 |
Kuipers, G., Beunk, F.F., Yi, K. & van der Wateren, F.M., 2021: A 1.9 Ga glacial sedimentary-facies association at low palaeolatitude in the Bergslagen Group, Grythyttan Field, Central Sweden, Norwegian Journal of Geology 101 (1), p. 1-18. |
https://dx.doi.org/10.17850/njg101-1-1 |
2021 |
|
xxx |
Nov 14, 2025, 10:22:27 AM |
fhm |
1 |
6640194 |
494815 |
|
6642559 |
1449751 |
11E8j |